Move billsplit Flutter app into the monorepo

billsplit was a standalone Flutter app in ~/Downloads with one commit and no
git remote — that directory was the only copy of its history.

Three things the move needed beyond copying the tree:

- The root .gitignore silently swallowed 32 of its files (*.png, *.ico,
  *.manifest). Ignored files do not error on `git add`, they just vanish, so
  this would have committed an app that cannot build. Added a trailing block
  of ! overrides plus .binary-allowlist (which did not exist yet) — the
  documented in-repo exception for binaries a build genuinely needs. The
  ../testsAndMisc_binaries/ symlink scheme does not apply: those directories
  are gone, and a symlinked PNG breaks a fresh clone.

- billsplit/.github/workflows/ci.yaml was inert once nested; GitHub only reads
  workflows at the repository root. Relocated with a working-directory and a
  billsplit/** path filter.

- The app's coverage gate moved to python_pkg/billsplit_coverage/ so every
  Python file stays under python_pkg/, and gained a test suite at 100% branch
  coverage as that location requires. billsplit/ now holds only Dart.

Also replaces the stock Flutter icon with a family icon from the shared
generator. The glyph is a filled silhouette because the family's 72px stroke
cannot carry a fine torn edge, and the split is an evenodd-cut perforation so
the holes stay transparent on the foreground and monochrome layers.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

billsplit/.gitignore

@@ -0,0 +1,45 @@
+# Miscellaneous
+*.class
+*.log
+*.pyc
+*.swp
+.DS_Store
+.atom/
+.build/
+.buildlog/
+.history
+.svn/
+.swiftpm/
+migrate_working_dir/
+
+# IntelliJ related
+*.iml
+*.ipr
+*.iws
+.idea/
+
+# The .vscode folder contains launch configuration and tasks you configure in
+# VS Code which you may wish to be included in version control, so this line
+# is commented out by default.
+#.vscode/
+
+# Flutter/Dart/Pub related
+**/doc/api/
+**/ios/Flutter/.last_build_id
+.dart_tool/
+.flutter-plugins-dependencies
+.pub-cache/
+.pub/
+/build/
+/coverage/
+
+# Symbolication related
+app.*.symbols
+
+# Obfuscation related
+app.*.map.json
+
+# Android Studio will place build artifacts here
+/android/app/debug
+/android/app/profile
+/android/app/release

billsplit/.metadata

@@ -0,0 +1,42 @@
+# This file tracks properties of this Flutter project.
+# Used by Flutter tool to assess capabilities and perform upgrades etc.
+#
+# This file should be version controlled and should not be manually edited.
+
+version:
+  revision: "058e0af2c2b57e369d905a03ac9748b0ebf543c6"
+  channel: "stable"
+
+project_type: app
+
+# Tracks metadata for the flutter migrate command
+migration:
+  platforms:
+    - platform: root
+      create_revision: 058e0af2c2b57e369d905a03ac9748b0ebf543c6
+      base_revision: 058e0af2c2b57e369d905a03ac9748b0ebf543c6
+    - platform: android
+      create_revision: 058e0af2c2b57e369d905a03ac9748b0ebf543c6
+      base_revision: 058e0af2c2b57e369d905a03ac9748b0ebf543c6
+    - platform: ios
+      create_revision: 058e0af2c2b57e369d905a03ac9748b0ebf543c6
+      base_revision: 058e0af2c2b57e369d905a03ac9748b0ebf543c6
+    - platform: linux
+      create_revision: 058e0af2c2b57e369d905a03ac9748b0ebf543c6
+      base_revision: 058e0af2c2b57e369d905a03ac9748b0ebf543c6
+    - platform: macos
+      create_revision: 058e0af2c2b57e369d905a03ac9748b0ebf543c6
+      base_revision: 058e0af2c2b57e369d905a03ac9748b0ebf543c6
+    - platform: windows
+      create_revision: 058e0af2c2b57e369d905a03ac9748b0ebf543c6
+      base_revision: 058e0af2c2b57e369d905a03ac9748b0ebf543c6
+
+  # User provided section
+
+  # List of Local paths (relative to this file) that should be
+  # ignored by the migrate tool.
+  #
+  # Files that are not part of the templates will be ignored by default.
+  unmanaged_files:
+    - 'lib/main.dart'
+    - 'ios/Runner.xcodeproj/project.pbxproj'

billsplit/README.md

@@ -0,0 +1,77 @@
+# BillSplit
+
+Flutter app (mobile + desktop) for splitting shop receipts between people —
+including the drinkers vs non-drinkers case — with Biedronka e-paragon import
+and .xlsx export.
+
+## Features
+
+- **People roster** with a per-person _drinks alcohol_ toggle, plus arbitrary
+  **groups** (tags) like "meat eaters".
+- **Receipts**: import a Polish fiscal e-receipt JSON (`e-paragon`,
+  JPK_KASA_PARAGON_v2-0 — the file the Biedronka app exports; the embedded JWS
+  payload is decoded, signature not verified) or build one manually. Multiple
+  receipts persist locally (`state.json` in app documents).
+- **Per-item assignment**: each item is split among _Everyone / Drinkers /
+  Non-drinkers / a group / hand-picked people_. Alcohol is auto-detected on
+  import (wódka/piwo/wino/… keywords) and defaults to drinkers only; deposits
+  (kaucja) become their own line split among everyone. Category and assignment
+  are always editable — the keyword detection is a default, not a decision.
+- **Grosz-exact math**: every item's shares sum to exactly the item total
+  (largest-remainder distribution), so per-person totals reconcile with the
+  receipt to the grosz — no floating point drift.
+- **Totals view**: per person, with alcohol / rest breakdown, unassigned-item
+  warnings, and a reconciliation check against the paid amount.
+- **Export .xlsx**: one row per item with a 1/0 person matrix plus a summary —
+  same layout as the hand-made spreadsheet this app grew out of. Matrix and
+  summary are exported values (the app is the calculator); column totals are
+  live SUM formulas.
+
+## Running
+
+The repo ships `lib/`, `test/`, and `pubspec.yaml` without platform runner
+folders. Generate them once for the platforms you want:
+
+```sh
+cd billsplit
+flutter create . --platforms=linux,windows,macos,android,ios
+flutter pub get
+flutter run          # picks a connected device / desktop
+```
+
+Tested with Flutter 3.44.8 / Dart 3.10.
+
+## Tests
+
+```sh
+flutter test
+```
+
+Covers: parsing the real sample receipt in `test/fixtures/` (49 items +
+deposit, totals 590.55 + 7.00 = 597.55 zł), split invariants incl. a 500-case
+fuzz of the remainder distribution, assignment-mode resolution, and xlsx
+generation (the test writes `build/test_export.xlsx` for external inspection).
+
+## Design notes / edge cases
+
+- Money is `int` grosze end to end; formatting happens only at the UI edge.
+- An item resolving to zero people (e.g. "non-drinkers" on an all-drinker
+  receipt) is **excluded from totals and loudly flagged**, never silently
+  dropped into someone's bill.
+- Deleting a person prunes them from groups, receipt participants and custom
+  assignments; deleting a group falls back affected items to _Everyone_.
+- Assignment modes are stored symbolically (not as materialized ID sets), so
+  adding a person later automatically includes them in _Everyone_ items.
+  Touching a person checkbox materializes the current set and switches the
+  item to _custom_.
+- `paidTotalGr` (what the card was charged) is kept separately from the item
+  sum; a mismatch shows red in Totals instead of being "fixed" silently.
+
+## Quality gates (enforced in CI)
+
+- `dart format --set-exit-if-changed .` — formatting is canonical
+- `flutter analyze --fatal-infos` — `very_good_analysis` + `strict-casts`,
+  `strict-inference`, `strict-raw-types`; any info fails the build
+- `flutter test --coverage` + `tool/coverage_check.py` — **100% line
+  coverage of `lib/` is mandatory**; the gate also fails if a lib file is
+  never executed by any test

billsplit/analysis_options.yaml

@@ -0,0 +1,7 @@
+include: package:very_good_analysis/analysis_options.yaml
+
+analyzer:
+  language:
+    strict-casts: true
+    strict-inference: true
+    strict-raw-types: true

billsplit/android/.gitignore

@@ -0,0 +1,14 @@
+gradle-wrapper.jar
+/.gradle
+/captures/
+/gradlew
+/gradlew.bat
+/local.properties
+GeneratedPluginRegistrant.java
+.cxx/
+
+# Remember to never publicly share your keystore.
+# See https://flutter.dev/to/reference-keystore
+key.properties
+**/*.keystore
+**/*.jks

billsplit/android/app/build.gradle.kts

@@ -0,0 +1,45 @@
+plugins {
+    id("com.android.application")
+    // The Flutter Gradle Plugin must be applied after the Android and Kotlin Gradle plugins.
+    id("dev.flutter.flutter-gradle-plugin")
+}
+
+android {
+    namespace = "dev.kuhy.billsplit"
+    compileSdk = flutter.compileSdkVersion
+    ndkVersion = flutter.ndkVersion
+
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_17
+        targetCompatibility = JavaVersion.VERSION_17
+    }
+
+    defaultConfig {
+        // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
+        applicationId = "dev.kuhy.billsplit"
+        // You can update the following values to match your application needs.
+        // For more information, see: https://flutter.dev/to/review-gradle-config.
+        minSdk = flutter.minSdkVersion
+        targetSdk = flutter.targetSdkVersion
+        versionCode = flutter.versionCode
+        versionName = flutter.versionName
+    }
+
+    buildTypes {
+        release {
+            // TODO: Add your own signing config for the release build.
+            // Signing with the debug keys for now, so `flutter run --release` works.
+            signingConfig = signingConfigs.getByName("debug")
+        }
+    }
+}
+
+kotlin {
+    compilerOptions {
+        jvmTarget = org.jetbrains.kotlin.gradle.dsl.JvmTarget.JVM_17
+    }
+}
+
+flutter {
+    source = "../.."
+}

billsplit/android/app/src/debug/AndroidManifest.xml

@@ -0,0 +1,7 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <!-- The INTERNET permission is required for development. Specifically,
+         the Flutter tool needs it to communicate with the running application
+         to allow setting breakpoints, to provide hot reload, etc.
+    -->
+    <uses-permission android:name="android.permission.INTERNET"/>
+</manifest>

billsplit/android/app/src/main/AndroidManifest.xml

@@ -0,0 +1,45 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <application
+        android:label="billsplit"
+        android:name="${applicationName}"
+        android:icon="@mipmap/ic_launcher">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true"
+            android:launchMode="singleTop"
+            android:taskAffinity=""
+            android:theme="@style/LaunchTheme"
+            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
+            android:hardwareAccelerated="true"
+            android:windowSoftInputMode="adjustResize">
+            <!-- Specifies an Android theme to apply to this Activity as soon as
+                 the Android process has started. This theme is visible to the user
+                 while the Flutter UI initializes. After that, this theme continues
+                 to determine the Window background behind the Flutter UI. -->
+            <meta-data
+              android:name="io.flutter.embedding.android.NormalTheme"
+              android:resource="@style/NormalTheme"
+              />
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN"/>
+                <category android:name="android.intent.category.LAUNCHER"/>
+            </intent-filter>
+        </activity>
+        <!-- Don't delete the meta-data below.
+             This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->
+        <meta-data
+            android:name="flutterEmbedding"
+            android:value="2" />
+    </application>
+    <!-- Required to query activities that can process text, see:
+         https://developer.android.com/training/package-visibility and
+         https://developer.android.com/reference/android/content/Intent#ACTION_PROCESS_TEXT.
+
+         In particular, this is used by the Flutter engine in io.flutter.plugin.text.ProcessTextPlugin. -->
+    <queries>
+        <intent>
+            <action android:name="android.intent.action.PROCESS_TEXT"/>
+            <data android:mimeType="text/plain"/>
+        </intent>
+    </queries>
+</manifest>

billsplit/android/app/src/main/kotlin/dev/kuhy/billsplit/MainActivity.kt

@@ -0,0 +1,5 @@
+package dev.kuhy.billsplit
+
+import io.flutter.embedding.android.FlutterActivity
+
+class MainActivity : FlutterActivity()

billsplit/android/app/src/main/res/drawable-v21/launch_background.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Modify this file to customize your launch splash screen -->
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:drawable="?android:colorBackground" />
+
+    <!-- You can insert your own image assets here -->
+    <!-- <item>
+        <bitmap
+            android:gravity="center"
+            android:src="@mipmap/launch_image" />
+    </item> -->
+</layer-list>

billsplit/android/app/src/main/res/drawable/launch_background.xml

@@ -0,0 +1,12 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Modify this file to customize your launch splash screen -->
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:drawable="@android:color/white" />
+
+    <!-- You can insert your own image assets here -->
+    <!-- <item>
+        <bitmap
+            android:gravity="center"
+            android:src="@mipmap/launch_image" />
+    </item> -->
+</layer-list>

billsplit/android/app/src/main/res/mipmap-anydpi-v26/ic_launcher.xml

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+  <background android:drawable="@color/ic_launcher_background"/>
+  <foreground>
+      <inset
+          android:drawable="@drawable/ic_launcher_foreground"
+          android:inset="16%" />
+  </foreground>
+  <monochrome>
+      <inset
+          android:drawable="@drawable/ic_launcher_monochrome"
+          android:inset="16%" />
+  </monochrome>
+</adaptive-icon>

billsplit/android/app/src/main/res/values-night/styles.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!-- Theme applied to the Android Window while the process is starting when the OS's Dark Mode setting is on -->
+    <style name="LaunchTheme" parent="@android:style/Theme.Black.NoTitleBar">
+        <!-- Show a splash screen on the activity. Automatically removed when
+             the Flutter engine draws its first frame -->
+        <item name="android:windowBackground">@drawable/launch_background</item>
+    </style>
+    <!-- Theme applied to the Android Window as soon as the process has started.
+         This theme determines the color of the Android Window while your
+         Flutter UI initializes, as well as behind your Flutter UI while its
+         running.
+
+         This Theme is only used starting with V2 of Flutter's Android embedding. -->
+    <style name="NormalTheme" parent="@android:style/Theme.Black.NoTitleBar">
+        <item name="android:windowBackground">?android:colorBackground</item>
+    </style>
+</resources>

billsplit/android/app/src/main/res/values/colors.xml

@@ -0,0 +1,4 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="ic_launcher_background">#211D1B</color>
+</resources>

billsplit/android/app/src/main/res/values/styles.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <!-- Theme applied to the Android Window while the process is starting when the OS's Dark Mode setting is off -->
+    <style name="LaunchTheme" parent="@android:style/Theme.Light.NoTitleBar">
+        <!-- Show a splash screen on the activity. Automatically removed when
+             the Flutter engine draws its first frame -->
+        <item name="android:windowBackground">@drawable/launch_background</item>
+    </style>
+    <!-- Theme applied to the Android Window as soon as the process has started.
+         This theme determines the color of the Android Window while your
+         Flutter UI initializes, as well as behind your Flutter UI while its
+         running.
+
+         This Theme is only used starting with V2 of Flutter's Android embedding. -->
+    <style name="NormalTheme" parent="@android:style/Theme.Light.NoTitleBar">
+        <item name="android:windowBackground">?android:colorBackground</item>
+    </style>
+</resources>

billsplit/android/app/src/profile/AndroidManifest.xml

@@ -0,0 +1,7 @@
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+    <!-- The INTERNET permission is required for development. Specifically,
+         the Flutter tool needs it to communicate with the running application
+         to allow setting breakpoints, to provide hot reload, etc.
+    -->
+    <uses-permission android:name="android.permission.INTERNET"/>
+</manifest>

billsplit/android/build.gradle.kts

@@ -0,0 +1,24 @@
+allprojects {
+    repositories {
+        google()
+        mavenCentral()
+    }
+}
+
+val newBuildDir: Directory =
+    rootProject.layout.buildDirectory
+        .dir("../../build")
+        .get()
+rootProject.layout.buildDirectory.value(newBuildDir)
+
+subprojects {
+    val newSubprojectBuildDir: Directory = newBuildDir.dir(project.name)
+    project.layout.buildDirectory.value(newSubprojectBuildDir)
+}
+subprojects {
+    project.evaluationDependsOn(":app")
+}
+
+tasks.register<Delete>("clean") {
+    delete(rootProject.layout.buildDirectory)
+}

billsplit/android/gradle.properties

@@ -0,0 +1,6 @@
+org.gradle.jvmargs=-Xmx8G -XX:MaxMetaspaceSize=4G -XX:ReservedCodeCacheSize=512m -XX:+HeapDumpOnOutOfMemoryError
+android.useAndroidX=true
+# This newDsl flag was added by the Flutter template
+android.newDsl=false
+# This builtInKotlin flag was added by the Flutter template
+android.builtInKotlin=false

billsplit/android/gradle/wrapper/gradle-wrapper.properties

@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.1.0-all.zip

billsplit/android/settings.gradle.kts

@@ -0,0 +1,26 @@
+pluginManagement {
+    val flutterSdkPath =
+        run {
+            val properties = java.util.Properties()
+            file("local.properties").inputStream().use { properties.load(it) }
+            val flutterSdkPath = properties.getProperty("flutter.sdk")
+            require(flutterSdkPath != null) { "flutter.sdk not set in local.properties" }
+            flutterSdkPath
+        }
+
+    includeBuild("$flutterSdkPath/packages/flutter_tools/gradle")
+
+    repositories {
+        google()
+        mavenCentral()
+        gradlePluginPortal()
+    }
+}
+
+plugins {
+    id("dev.flutter.flutter-plugin-loader") version "1.0.0"
+    id("com.android.application") version "9.0.1" apply false
+    id("org.jetbrains.kotlin.android") version "2.3.20" apply false
+}
+
+include(":app")

billsplit/assets/icon/icon.svg

@@ -0,0 +1,6 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="1024" height="1024" viewBox="0 0 1024 1024">
+  <rect width="1024" height="1024" fill="#211D1B"/>
+  <g fill="none" stroke="#B8862E" stroke-width="72" stroke-linecap="round" stroke-linejoin="round" transform="translate(0,-5)">
+    <path fill="#B8862E" fill-rule="evenodd" stroke="none" d="M 312 282 L 712 282 L 712 706 L 678 752 L 645 706 L 612 752 L 578 706 L 545 752 L 512 706 L 478 752 L 445 706 L 412 752 L 378 706 L 345 752 L 312 706 Z M 482 350 A 30 30 0 1 0 542 350 A 30 30 0 1 0 482 350 Z M 482 446 A 30 30 0 1 0 542 446 A 30 30 0 1 0 482 446 Z M 482 542 A 30 30 0 1 0 542 542 A 30 30 0 1 0 482 542 Z M 482 638 A 30 30 0 1 0 542 638 A 30 30 0 1 0 482 638 Z"/>
+  </g>
+</svg>

billsplit/assets/icon/icon_foreground.svg

@@ -0,0 +1,5 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="1024" height="1024" viewBox="0 0 1024 1024">
+  <g fill="none" stroke="#B8862E" stroke-width="72" stroke-linecap="round" stroke-linejoin="round" transform="translate(0,-5)">
+    <path fill="#B8862E" fill-rule="evenodd" stroke="none" d="M 312 282 L 712 282 L 712 706 L 678 752 L 645 706 L 612 752 L 578 706 L 545 752 L 512 706 L 478 752 L 445 706 L 412 752 L 378 706 L 345 752 L 312 706 Z M 482 350 A 30 30 0 1 0 542 350 A 30 30 0 1 0 482 350 Z M 482 446 A 30 30 0 1 0 542 446 A 30 30 0 1 0 482 446 Z M 482 542 A 30 30 0 1 0 542 542 A 30 30 0 1 0 482 542 Z M 482 638 A 30 30 0 1 0 542 638 A 30 30 0 1 0 482 638 Z"/>
+  </g>
+</svg>

billsplit/assets/icon/icon_monochrome.svg

@@ -0,0 +1,5 @@
+<svg xmlns="http://www.w3.org/2000/svg" width="1024" height="1024" viewBox="0 0 1024 1024">
+  <g fill="none" stroke="#FFFFFF" stroke-width="72" stroke-linecap="round" stroke-linejoin="round" transform="translate(0,-5)">
+    <path fill="#FFFFFF" fill-rule="evenodd" stroke="none" d="M 312 282 L 712 282 L 712 706 L 678 752 L 645 706 L 612 752 L 578 706 L 545 752 L 512 706 L 478 752 L 445 706 L 412 752 L 378 706 L 345 752 L 312 706 Z M 482 350 A 30 30 0 1 0 542 350 A 30 30 0 1 0 482 350 Z M 482 446 A 30 30 0 1 0 542 446 A 30 30 0 1 0 482 446 Z M 482 542 A 30 30 0 1 0 542 542 A 30 30 0 1 0 482 542 Z M 482 638 A 30 30 0 1 0 542 638 A 30 30 0 1 0 482 638 Z"/>
+  </g>
+</svg>

billsplit/ios/.gitignore

@@ -0,0 +1,34 @@
+**/dgph
+*.mode1v3
+*.mode2v3
+*.moved-aside
+*.pbxuser
+*.perspectivev3
+**/*sync/
+.sconsign.dblite
+.tags*
+**/.vagrant/
+**/DerivedData/
+Icon?
+**/Pods/
+**/.symlinks/
+profile
+xcuserdata
+**/.generated/
+Flutter/App.framework
+Flutter/Flutter.framework
+Flutter/Flutter.podspec
+Flutter/Generated.xcconfig
+Flutter/ephemeral/
+Flutter/app.flx
+Flutter/app.zip
+Flutter/flutter_assets/
+Flutter/flutter_export_environment.sh
+ServiceDefinitions.json
+Runner/GeneratedPluginRegistrant.*
+
+# Exceptions to above rules.
+!default.mode1v3
+!default.mode2v3
+!default.pbxuser
+!default.perspectivev3

billsplit/ios/Flutter/AppFrameworkInfo.plist

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+  <key>CFBundleDevelopmentRegion</key>
+  <string>en</string>
+  <key>CFBundleExecutable</key>
+  <string>App</string>
+  <key>CFBundleIdentifier</key>
+  <string>io.flutter.flutter.app</string>
+  <key>CFBundleInfoDictionaryVersion</key>
+  <string>6.0</string>
+  <key>CFBundleName</key>
+  <string>App</string>
+  <key>CFBundlePackageType</key>
+  <string>FMWK</string>
+  <key>CFBundleShortVersionString</key>
+  <string>1.0</string>
+  <key>CFBundleSignature</key>
+  <string>????</string>
+  <key>CFBundleVersion</key>
+  <string>1.0</string>
+</dict>
+</plist>

billsplit/ios/Flutter/Debug.xcconfig

@@ -0,0 +1 @@
+#include "Generated.xcconfig"

billsplit/ios/Flutter/Release.xcconfig

@@ -0,0 +1 @@
+#include "Generated.xcconfig"

billsplit/ios/Runner.xcodeproj/project.pbxproj

@@ -0,0 +1,644 @@
+// !$*UTF8*$!
+{
+	archiveVersion = 1;
+	classes = {
+	};
+	objectVersion = 54;
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+				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
+				CLANG_WARN_STRICT_PROTOTYPES = YES;
+				CLANG_WARN_SUSPICIOUS_MOVE = YES;
+				CLANG_WARN_UNREACHABLE_CODE = YES;
+				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
+				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
+				COPY_PHASE_STRIP = NO;
+				DEBUG_INFORMATION_FORMAT = dwarf;
+				ENABLE_STRICT_OBJC_MSGSEND = YES;
+				ENABLE_TESTABILITY = YES;
+				ENABLE_USER_SCRIPT_SANDBOXING = NO;
+				GCC_C_LANGUAGE_STANDARD = gnu99;
+				GCC_DYNAMIC_NO_PIC = NO;
+				GCC_NO_COMMON_BLOCKS = YES;
+				GCC_OPTIMIZATION_LEVEL = 0;
+				GCC_PREPROCESSOR_DEFINITIONS = (
+					"DEBUG=1",
+					"$(inherited)",
+				);
+				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
+				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_UNDECLARED_SELECTOR = YES;
+				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
+				GCC_WARN_UNUSED_FUNCTION = YES;
+				GCC_WARN_UNUSED_VARIABLE = YES;
+				IPHONEOS_DEPLOYMENT_TARGET = 13.0;
+				MTL_ENABLE_DEBUG_INFO = YES;
+				ONLY_ACTIVE_ARCH = YES;
+				SDKROOT = iphoneos;
+				TARGETED_DEVICE_FAMILY = "1,2";
+			};
+			name = Debug;
+		};
+		97C147041CF9000F007C117D /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ALWAYS_SEARCH_USER_PATHS = NO;
+				ASSETCATALOG_COMPILER_GENERATE_SWIFT_ASSET_SYMBOL_EXTENSIONS = YES;
+				CLANG_ANALYZER_NONNULL = YES;
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++0x";
+				CLANG_CXX_LIBRARY = "libc++";
+				CLANG_ENABLE_MODULES = YES;
+				CLANG_ENABLE_OBJC_ARC = YES;
+				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
+				CLANG_WARN_BOOL_CONVERSION = YES;
+				CLANG_WARN_COMMA = YES;
+				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
+				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
+				CLANG_WARN_EMPTY_BODY = YES;
+				CLANG_WARN_ENUM_CONVERSION = YES;
+				CLANG_WARN_INFINITE_RECURSION = YES;
+				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
+				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
+				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
+				CLANG_WARN_STRICT_PROTOTYPES = YES;
+				CLANG_WARN_SUSPICIOUS_MOVE = YES;
+				CLANG_WARN_UNREACHABLE_CODE = YES;
+				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
+				"CODE_SIGN_IDENTITY[sdk=iphoneos*]" = "iPhone Developer";
+				COPY_PHASE_STRIP = NO;
+				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
+				ENABLE_NS_ASSERTIONS = NO;
+				ENABLE_STRICT_OBJC_MSGSEND = YES;
+				ENABLE_USER_SCRIPT_SANDBOXING = NO;
+				GCC_C_LANGUAGE_STANDARD = gnu99;
+				GCC_NO_COMMON_BLOCKS = YES;
+				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
+				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_UNDECLARED_SELECTOR = YES;
+				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
+				GCC_WARN_UNUSED_FUNCTION = YES;
+				GCC_WARN_UNUSED_VARIABLE = YES;
+				IPHONEOS_DEPLOYMENT_TARGET = 13.0;
+				MTL_ENABLE_DEBUG_INFO = NO;
+				SDKROOT = iphoneos;
+				SUPPORTED_PLATFORMS = iphoneos;
+				SWIFT_COMPILATION_MODE = wholemodule;
+				SWIFT_OPTIMIZATION_LEVEL = "-O";
+				TARGETED_DEVICE_FAMILY = "1,2";
+				VALIDATE_PRODUCT = YES;
+			};
+			name = Release;
+		};
+		97C147061CF9000F007C117D /* Debug */ = {
+			isa = XCBuildConfiguration;
+			baseConfigurationReference = 9740EEB21CF90195004384FC /* Debug.xcconfig */;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				CLANG_ENABLE_MODULES = YES;
+				CURRENT_PROJECT_VERSION = "$(FLUTTER_BUILD_NUMBER)";
+				ENABLE_BITCODE = NO;
+				INFOPLIST_FILE = Runner/Info.plist;
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+				);
+				PRODUCT_BUNDLE_IDENTIFIER = dev.kuhy.billsplit;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_OBJC_BRIDGING_HEADER = "Runner/Runner-Bridging-Header.h";
+				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
+				SWIFT_VERSION = 5.0;
+				VERSIONING_SYSTEM = "apple-generic";
+			};
+			name = Debug;
+		};
+		97C147071CF9000F007C117D /* Release */ = {
+			isa = XCBuildConfiguration;
+			baseConfigurationReference = 7AFA3C8E1D35360C0083082E /* Release.xcconfig */;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				CLANG_ENABLE_MODULES = YES;
+				CURRENT_PROJECT_VERSION = "$(FLUTTER_BUILD_NUMBER)";
+				ENABLE_BITCODE = NO;
+				INFOPLIST_FILE = Runner/Info.plist;
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+				);
+				PRODUCT_BUNDLE_IDENTIFIER = dev.kuhy.billsplit;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_OBJC_BRIDGING_HEADER = "Runner/Runner-Bridging-Header.h";
+				SWIFT_VERSION = 5.0;
+				VERSIONING_SYSTEM = "apple-generic";
+			};
+			name = Release;
+		};
+/* End XCBuildConfiguration section */
+
+/* Begin XCConfigurationList section */
+		331C8087294A63A400263BE5 /* Build configuration list for PBXNativeTarget "RunnerTests" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				331C8088294A63A400263BE5 /* Debug */,
+				331C8089294A63A400263BE5 /* Release */,
+				331C808A294A63A400263BE5 /* Profile */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+		97C146E91CF9000F007C117D /* Build configuration list for PBXProject "Runner" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				97C147031CF9000F007C117D /* Debug */,
+				97C147041CF9000F007C117D /* Release */,
+				249021D3217E4FDB00AE95B9 /* Profile */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+		97C147051CF9000F007C117D /* Build configuration list for PBXNativeTarget "Runner" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				97C147061CF9000F007C117D /* Debug */,
+				97C147071CF9000F007C117D /* Release */,
+				249021D4217E4FDB00AE95B9 /* Profile */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+/* End XCConfigurationList section */
+
+/* Begin XCLocalSwiftPackageReference section */
+		781AD8BC2B33823900A9FFBB /* XCLocalSwiftPackageReference "Flutter/ephemeral/Packages/FlutterGeneratedPluginSwiftPackage" */ = {
+			isa = XCLocalSwiftPackageReference;
+			relativePath = Flutter/ephemeral/Packages/FlutterGeneratedPluginSwiftPackage;
+		};
+/* End XCLocalSwiftPackageReference section */
+
+/* Begin XCSwiftPackageProductDependency section */
+		78A3181F2AECB46A00862997 /* FlutterGeneratedPluginSwiftPackage */ = {
+			isa = XCSwiftPackageProductDependency;
+			productName = FlutterGeneratedPluginSwiftPackage;
+		};
+/* End XCSwiftPackageProductDependency section */
+	};
+	rootObject = 97C146E61CF9000F007C117D /* Project object */;
+}

billsplit/ios/Runner.xcodeproj/project.xcworkspace/contents.xcworkspacedata

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "self:">
+   </FileRef>
+</Workspace>

billsplit/ios/Runner.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

billsplit/ios/Runner.xcodeproj/project.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>PreviewsEnabled</key>
+	<false/>
+</dict>
+</plist>

billsplit/ios/Runner.xcodeproj/xcshareddata/xcschemes/Runner.xcscheme

@@ -0,0 +1,119 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Scheme
+   LastUpgradeVersion = "1510"
+   version = "1.3">
+   <BuildAction
+      parallelizeBuildables = "YES"
+      buildImplicitDependencies = "YES">
+      <PreActions>
+         <ExecutionAction
+            ActionType = "Xcode.IDEStandardExecutionActionsCore.ExecutionActionType.ShellScriptAction">
+            <ActionContent
+               title = "Run Prepare Flutter Framework Script"
+               scriptText = "/bin/sh &quot;$FLUTTER_ROOT/packages/flutter_tools/bin/xcode_backend.sh&quot; prepare&#10;">
+               <EnvironmentBuildable>
+                  <BuildableReference
+                     BuildableIdentifier = "primary"
+                     BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+                     BuildableName = "Runner.app"
+                     BlueprintName = "Runner"
+                     ReferencedContainer = "container:Runner.xcodeproj">
+                  </BuildableReference>
+               </EnvironmentBuildable>
+            </ActionContent>
+         </ExecutionAction>
+      </PreActions>
+      <BuildActionEntries>
+         <BuildActionEntry
+            buildForTesting = "YES"
+            buildForRunning = "YES"
+            buildForProfiling = "YES"
+            buildForArchiving = "YES"
+            buildForAnalyzing = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+               BuildableName = "Runner.app"
+               BlueprintName = "Runner"
+               ReferencedContainer = "container:Runner.xcodeproj">
+            </BuildableReference>
+         </BuildActionEntry>
+      </BuildActionEntries>
+   </BuildAction>
+   <TestAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      customLLDBInitFile = "$(SRCROOT)/Flutter/ephemeral/flutter_lldbinit"
+      shouldUseLaunchSchemeArgsEnv = "YES">
+      <MacroExpansion>
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+            BuildableName = "Runner.app"
+            BlueprintName = "Runner"
+            ReferencedContainer = "container:Runner.xcodeproj">
+         </BuildableReference>
+      </MacroExpansion>
+      <Testables>
+         <TestableReference
+            skipped = "NO"
+            parallelizable = "YES">
+            <BuildableReference
+               BuildableIdentifier = "primary"
+               BlueprintIdentifier = "331C8080294A63A400263BE5"
+               BuildableName = "RunnerTests.xctest"
+               BlueprintName = "RunnerTests"
+               ReferencedContainer = "container:Runner.xcodeproj">
+            </BuildableReference>
+         </TestableReference>
+      </Testables>
+   </TestAction>
+   <LaunchAction
+      buildConfiguration = "Debug"
+      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
+      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      customLLDBInitFile = "$(SRCROOT)/Flutter/ephemeral/flutter_lldbinit"
+      launchStyle = "0"
+      useCustomWorkingDirectory = "NO"
+      ignoresPersistentStateOnLaunch = "NO"
+      debugDocumentVersioning = "YES"
+      debugServiceExtension = "internal"
+      enableGPUValidationMode = "1"
+      allowLocationSimulation = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+            BuildableName = "Runner.app"
+            BlueprintName = "Runner"
+            ReferencedContainer = "container:Runner.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </LaunchAction>
+   <ProfileAction
+      buildConfiguration = "Profile"
+      shouldUseLaunchSchemeArgsEnv = "YES"
+      savedToolIdentifier = ""
+      useCustomWorkingDirectory = "NO"
+      debugDocumentVersioning = "YES">
+      <BuildableProductRunnable
+         runnableDebuggingMode = "0">
+         <BuildableReference
+            BuildableIdentifier = "primary"
+            BlueprintIdentifier = "97C146ED1CF9000F007C117D"
+            BuildableName = "Runner.app"
+            BlueprintName = "Runner"
+            ReferencedContainer = "container:Runner.xcodeproj">
+         </BuildableReference>
+      </BuildableProductRunnable>
+   </ProfileAction>
+   <AnalyzeAction
+      buildConfiguration = "Debug">
+   </AnalyzeAction>
+   <ArchiveAction
+      buildConfiguration = "Release"
+      revealArchiveInOrganizer = "YES">
+   </ArchiveAction>
+</Scheme>

billsplit/ios/Runner.xcworkspace/contents.xcworkspacedata

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "group:Runner.xcodeproj">
+   </FileRef>
+</Workspace>

billsplit/ios/Runner.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>

billsplit/ios/Runner.xcworkspace/xcshareddata/WorkspaceSettings.xcsettings

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>PreviewsEnabled</key>
+	<false/>
+</dict>
+</plist>

billsplit/ios/Runner/AppDelegate.swift

@@ -0,0 +1,16 @@
+import Flutter
+import UIKit
+
+@main
+@objc class AppDelegate: FlutterAppDelegate, FlutterImplicitEngineDelegate {
+  override func application(
+    _ application: UIApplication,
+    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
+  ) -> Bool {
+    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
+  }
+
+  func didInitializeImplicitFlutterEngine(_ engineBridge: FlutterImplicitEngineBridge) {
+    GeneratedPluginRegistrant.register(with: engineBridge.pluginRegistry)
+  }
+}

billsplit/ios/Runner/Assets.xcassets/AppIcon.appiconset/Contents.json

@@ -0,0 +1,122 @@
+{
+  "images": [
+    {
+      "size": "20x20",
+      "idiom": "iphone",
+      "filename": "Icon-App-20x20@2x.png",
+      "scale": "2x"
+    },
+    {
+      "size": "20x20",
+      "idiom": "iphone",
+      "filename": "Icon-App-20x20@3x.png",
+      "scale": "3x"
+    },
+    {
+      "size": "29x29",
+      "idiom": "iphone",
+      "filename": "Icon-App-29x29@1x.png",
+      "scale": "1x"
+    },
+    {
+      "size": "29x29",
+      "idiom": "iphone",
+      "filename": "Icon-App-29x29@2x.png",
+      "scale": "2x"
+    },
+    {
+      "size": "29x29",
+      "idiom": "iphone",
+      "filename": "Icon-App-29x29@3x.png",
+      "scale": "3x"
+    },
+    {
+      "size": "40x40",
+      "idiom": "iphone",
+      "filename": "Icon-App-40x40@2x.png",
+      "scale": "2x"
+    },
+    {
+      "size": "40x40",
+      "idiom": "iphone",
+      "filename": "Icon-App-40x40@3x.png",
+      "scale": "3x"
+    },
+    {
+      "size": "60x60",
+      "idiom": "iphone",
+      "filename": "Icon-App-60x60@2x.png",
+      "scale": "2x"
+    },
+    {
+      "size": "60x60",
+      "idiom": "iphone",
+      "filename": "Icon-App-60x60@3x.png",
+      "scale": "3x"
+    },
+    {
+      "size": "20x20",
+      "idiom": "ipad",
+      "filename": "Icon-App-20x20@1x.png",
+      "scale": "1x"
+    },
+    {
+      "size": "20x20",
+      "idiom": "ipad",
+      "filename": "Icon-App-20x20@2x.png",
+      "scale": "2x"
+    },
+    {
+      "size": "29x29",
+      "idiom": "ipad",
+      "filename": "Icon-App-29x29@1x.png",
+      "scale": "1x"
+    },
+    {
+      "size": "29x29",
+      "idiom": "ipad",
+      "filename": "Icon-App-29x29@2x.png",
+      "scale": "2x"
+    },
+    {
+      "size": "40x40",
+      "idiom": "ipad",
+      "filename": "Icon-App-40x40@1x.png",
+      "scale": "1x"
+    },
+    {
+      "size": "40x40",
+      "idiom": "ipad",
+      "filename": "Icon-App-40x40@2x.png",
+      "scale": "2x"
+    },
+    {
+      "size": "76x76",
+      "idiom": "ipad",
+      "filename": "Icon-App-76x76@1x.png",
+      "scale": "1x"
+    },
+    {
+      "size": "76x76",
+      "idiom": "ipad",
+      "filename": "Icon-App-76x76@2x.png",
+      "scale": "2x"
+    },
+    {
+      "size": "83.5x83.5",
+      "idiom": "ipad",
+      "filename": "Icon-App-83.5x83.5@2x.png",
+      "scale": "2x"
+    },
+    {
+      "size": "1024x1024",
+      "idiom": "ios-marketing",
+      "filename": "Icon-App-1024x1024@1x.png",
+      "scale": "1x"
+    }
+  ],
+  "info": {
+    "version": 1,
+    "author": "xcode"
+  }
+}

billsplit/ios/Runner/Assets.xcassets/LaunchImage.imageset/Contents.json

@@ -0,0 +1,23 @@
+{
+  "images": [
+    {
+      "idiom": "universal",
+      "filename": "LaunchImage.png",
+      "scale": "1x"
+    },
+    {
+      "idiom": "universal",
+      "filename": "LaunchImage@2x.png",
+      "scale": "2x"
+    },
+    {
+      "idiom": "universal",
+      "filename": "LaunchImage@3x.png",
+      "scale": "3x"
+    }
+  ],
+  "info": {
+    "version": 1,
+    "author": "xcode"
+  }
+}

billsplit/ios/Runner/Assets.xcassets/LaunchImage.imageset/README.md

@@ -0,0 +1,5 @@
+# Launch Screen Assets
+
+You can customize the launch screen with your own desired assets by replacing the image files in this directory.
+
+You can also do it by opening your Flutter project's Xcode project with `open ios/Runner.xcworkspace`, selecting `Runner/Assets.xcassets` in the Project Navigator and dropping in the desired images.

billsplit/ios/Runner/Base.lproj/LaunchScreen.storyboard

@@ -0,0 +1,37 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="12121" systemVersion="16G29" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
+    <dependencies>
+        <deployment identifier="iOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="12089"/>
+    </dependencies>
+    <scenes>
+        <!--View Controller-->
+        <scene sceneID="EHf-IW-A2E">
+            <objects>
+                <viewController id="01J-lp-oVM" sceneMemberID="viewController">
+                    <layoutGuides>
+                        <viewControllerLayoutGuide type="top" id="Ydg-fD-yQy"/>
+                        <viewControllerLayoutGuide type="bottom" id="xbc-2k-c8Z"/>
+                    </layoutGuides>
+                    <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <subviews>
+                            <imageView opaque="NO" clipsSubviews="YES" multipleTouchEnabled="YES" contentMode="center" image="LaunchImage" translatesAutoresizingMaskIntoConstraints="NO" id="YRO-k0-Ey4">
+                            </imageView>
+                        </subviews>
+                        <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
+                        <constraints>
+                            <constraint firstItem="YRO-k0-Ey4" firstAttribute="centerX" secondItem="Ze5-6b-2t3" secondAttribute="centerX" id="1a2-6s-vTC"/>
+                            <constraint firstItem="YRO-k0-Ey4" firstAttribute="centerY" secondItem="Ze5-6b-2t3" secondAttribute="centerY" id="4X2-HB-R7a"/>
+                        </constraints>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
+            </objects>
+            <point key="canvasLocation" x="53" y="375"/>
+        </scene>
+    </scenes>
+    <resources>
+        <image name="LaunchImage" width="168" height="185"/>
+    </resources>
+</document>

billsplit/ios/Runner/Base.lproj/Main.storyboard

@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="10117" systemVersion="15F34" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" initialViewController="BYZ-38-t0r">
+    <dependencies>
+        <deployment identifier="iOS"/>
+        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="10085"/>
+    </dependencies>
+    <scenes>
+        <!--Flutter View Controller-->
+        <scene sceneID="tne-QT-ifu">
+            <objects>
+                <viewController id="BYZ-38-t0r" customClass="FlutterViewController" sceneMemberID="viewController">
+                    <layoutGuides>
+                        <viewControllerLayoutGuide type="top" id="y3c-jy-aDJ"/>
+                        <viewControllerLayoutGuide type="bottom" id="wfy-db-euE"/>
+                    </layoutGuides>
+                    <view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
+                        <rect key="frame" x="0.0" y="0.0" width="600" height="600"/>
+                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
+                        <color key="backgroundColor" white="1" alpha="1" colorSpace="custom" customColorSpace="calibratedWhite"/>
+                    </view>
+                </viewController>
+                <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
+            </objects>
+        </scene>
+    </scenes>
+</document>

billsplit/ios/Runner/Info.plist

@@ -0,0 +1,70 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CADisableMinimumFrameDurationOnPhone</key>
+	<true/>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>$(DEVELOPMENT_LANGUAGE)</string>
+	<key>CFBundleDisplayName</key>
+	<string>Billsplit</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>billsplit</string>
+	<key>CFBundlePackageType</key>
+	<string>APPL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>$(FLUTTER_BUILD_NAME)</string>
+	<key>CFBundleSignature</key>
+	<string>????</string>
+	<key>CFBundleVersion</key>
+	<string>$(FLUTTER_BUILD_NUMBER)</string>
+	<key>LSRequiresIPhoneOS</key>
+	<true/>
+	<key>UIApplicationSceneManifest</key>
+	<dict>
+		<key>UIApplicationSupportsMultipleScenes</key>
+		<false/>
+		<key>UISceneConfigurations</key>
+		<dict>
+			<key>UIWindowSceneSessionRoleApplication</key>
+			<array>
+				<dict>
+					<key>UISceneClassName</key>
+					<string>UIWindowScene</string>
+					<key>UISceneConfigurationName</key>
+					<string>flutter</string>
+					<key>UISceneDelegateClassName</key>
+					<string>$(PRODUCT_MODULE_NAME).SceneDelegate</string>
+					<key>UISceneStoryboardFile</key>
+					<string>Main</string>
+				</dict>
+			</array>
+		</dict>
+	</dict>
+	<key>UIApplicationSupportsIndirectInputEvents</key>
+	<true/>
+	<key>UILaunchStoryboardName</key>
+	<string>LaunchScreen</string>
+	<key>UIMainStoryboardFile</key>
+	<string>Main</string>
+	<key>UISupportedInterfaceOrientations</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+	<key>UISupportedInterfaceOrientations~ipad</key>
+	<array>
+		<string>UIInterfaceOrientationPortrait</string>
+		<string>UIInterfaceOrientationPortraitUpsideDown</string>
+		<string>UIInterfaceOrientationLandscapeLeft</string>
+		<string>UIInterfaceOrientationLandscapeRight</string>
+	</array>
+</dict>
+</plist>

billsplit/ios/Runner/Runner-Bridging-Header.h

@@ -0,0 +1 @@
+#import "GeneratedPluginRegistrant.h"

billsplit/ios/Runner/SceneDelegate.swift

@@ -0,0 +1,6 @@
+import Flutter
+import UIKit
+
+class SceneDelegate: FlutterSceneDelegate {
+
+}

billsplit/ios/RunnerTests/RunnerTests.swift

@@ -0,0 +1,12 @@
+import Flutter
+import UIKit
+import XCTest
+
+class RunnerTests: XCTestCase {
+
+  func testExample() {
+    // If you add code to the Runner application, consider adding tests here.
+    // See https://developer.apple.com/documentation/xctest for more information about using XCTest.
+  }
+
+}

billsplit/lib/domain/eparagon_parser.dart

@@ -0,0 +1,293 @@
+/// Parser for Polish fiscal e-receipts (e-paragon / JPK_KASA_PARAGON_v2-0),
+/// e.g. the JSON files produced by the Biedronka app.
+///
+/// Accepted inputs:
+///  * the full wrapper JSON containing a `data` field with a JWS
+///    (header.payload.signature, base64url) whose payload is the JPK document;
+///  * the decoded JPK payload itself (an object with `dokument.paragon`);
+///  * a bare JWS token string.
+///
+/// The signature is NOT verified — this app only reads the contents.
+library;
+
+import 'dart:convert';
+
+import 'package:billsplit/domain/models.dart';
+
+/// A parsed receipt plus non-fatal [warnings] collected on the way.
+class EParagonResult {
+  /// Bundles a parsed [receipt] with its [warnings].
+  EParagonResult({required this.receipt, required this.warnings});
+
+  /// The parsed receipt.
+  final Receipt receipt;
+
+  /// Human-readable warnings (e.g. sum mismatches, skipped lines).
+  final List<String> warnings;
+}
+
+/// Thrown when the input cannot be interpreted as an e-paragon.
+class EParagonParseException implements Exception {
+  /// Creates the exception with a user-facing [message].
+  EParagonParseException(this.message);
+
+  /// User-facing description of what went wrong.
+  final String message;
+
+  @override
+  String toString() => 'EParagonParseException: $message';
+}
+
+const _alcoholKeywords = [
+  'wódk',
+  'wodka',
+  'vodka',
+  'piwo',
+  'wino',
+  'whisk',
+  'likier',
+  'nalewk',
+  'cydr',
+  ' rum',
+  'gin ',
+  'tequil',
+  'brandy',
+  'koniak',
+  'bourbon',
+];
+
+const _mixerKeywords = [
+  'tonic',
+  'tonik',
+  'kinley',
+  'citrus mix',
+  'limonka',
+  'cytryna',
+];
+
+/// Parses [source] and returns just the receipt; see [parseEParagonDetailed].
+Receipt parseEParagon(String source) => parseEParagonDetailed(source).receipt;
+
+/// Parses [source] (wrapper JSON, bare JPK payload, or bare JWS) into a
+/// [Receipt] plus warnings. Throws [EParagonParseException] on unusable input.
+EParagonResult parseEParagonDetailed(String source) {
+  final warnings = <String>[];
+  final payload = _extractPayload(source);
+
+  final dokument = payload['dokument'];
+  if (dokument is! Map) {
+    throw EParagonParseException('No "dokument" object in payload.');
+  }
+  final paragon = dokument['paragon'];
+  if (paragon is! Map) {
+    throw EParagonParseException('No "dokument.paragon" object in payload.');
+  }
+
+  final store = _storeName(dokument);
+  final date = _saleDate(paragon, dokument);
+
+  final items = <Item>[];
+  final pozycje = paragon['pozycja'];
+  if (pozycje is List) {
+    for (final p in pozycje) {
+      final towar = (p is Map) ? p['towar'] : null;
+      if (towar is! Map) continue;
+      final it = _itemFromTowar(towar.cast<String, dynamic>(), warnings);
+      if (it != null) items.add(it);
+    }
+  }
+  if (items.isEmpty) {
+    throw EParagonParseException('Receipt has no line items.');
+  }
+
+  // Bottle deposits ("opakowania zwrotne" / kaucja) are outside sumaBrutto but
+  // part of what was paid; add each as a regular splittable line.
+  final opak = paragon['opak'];
+  if (opak is Map) {
+    final dane = opak['daneOpak'];
+    if (dane is List) {
+      for (final d in dane) {
+        if (d is! Map) continue;
+        final cena = _asInt(d['cena']);
+        final iloscMil = _asInt(d['ilosc']); // thousandths
+        final qty = iloscMil / 1000;
+        final total = (cena * iloscMil / 1000).round();
+        if (total == 0) continue;
+        items.add(
+          Item(
+            id: Ids.next(),
+            name: 'Kaucja: '
+                '${(d['nazwa'] as String? ?? 'opakowanie').trim()} (deposit)',
+            totalGr: total,
+            qty: qty,
+            unitPriceGr: cena,
+            category: Categories.deposit,
+          ),
+        );
+      }
+    }
+  }
+
+  // Reconciliation figures.
+  var paid = _asIntOrNull((paragon['total'] as Map?)?['zaplZwrot']);
+  final sumaBrutto = _asIntOrNull((paragon['podsum'] as Map?)?['sumaBrutto']);
+  final opakWart = _asIntOrNull((paragon['opak'] as Map?)?['wart']) ?? 0;
+  paid ??= sumaBrutto == null ? null : sumaBrutto + opakWart;
+
+  if (sumaBrutto != null) {
+    final goods = items
+        .where((i) => i.category != Categories.deposit)
+        .fold(0, (s, i) => s + i.totalGr);
+    if (goods != sumaBrutto) {
+      warnings.add(
+        'Sum of parsed items (${formatPln(goods)}) differs from receipt '
+        'sumaBrutto (${formatPln(sumaBrutto)}).',
+      );
+    }
+  }
+
+  final title = [
+    if (store != null) store,
+    _iso(date),
+  ].join(' ');
+
+  return EParagonResult(
+    receipt: Receipt(
+      id: Ids.next(),
+      title: title,
+      store: store,
+      date: date,
+      items: items,
+      paidTotalGr: paid,
+    ),
+    warnings: warnings,
+  );
+}
+
+String? _storeName(Map<dynamic, dynamic> dokument) {
+  final podmiot = dokument['podmiot1'];
+  if (podmiot is! Map) return null;
+  final name = (podmiot['nazwaPod'] as String?)?.trim();
+  if (name == null || name.isEmpty) return null;
+  // Friendlier alias for the most common chain.
+  if (name.toUpperCase().contains('JERONIMO MARTINS')) return 'Biedronka';
+  return name;
+}
+
+DateTime _saleDate(
+  Map<dynamic, dynamic> paragon,
+  Map<dynamic, dynamic> dokument,
+) {
+  final raw =
+      paragon['zakSprzed'] ?? (dokument['naglowek'] as Map?)?['dataJPK'];
+  if (raw is String) {
+    final d = DateTime.tryParse(raw);
+    if (d != null) return d.toLocal();
+  }
+  return DateTime.now();
+}
+
+String _iso(DateTime d) {
+  final m = d.month.toString().padLeft(2, '0');
+  final day = d.day.toString().padLeft(2, '0');
+  return '${d.year}-$m-$day';
+}
+
+Map<String, dynamic> _extractPayload(String source) {
+  dynamic root;
+  try {
+    root = jsonDecode(source.trim());
+  } on FormatException {
+    // Maybe the user pasted just the JWS token.
+    final p = _tryJws(source.trim());
+    if (p != null) return p;
+    throw EParagonParseException(
+      'Input is neither valid JSON nor a JWS.',
+    );
+  }
+  if (root is Map) {
+    if (root['dokument'] is Map) return root.cast<String, dynamic>();
+    final data = root['data'];
+    if (data is String) {
+      final p = _tryJws(data);
+      if (p != null) return p;
+      throw EParagonParseException('"data" field is not a decodable JWS.');
+    }
+  }
+  throw EParagonParseException(
+    'Unrecognized structure: expected e-paragon wrapper or JPK payload.',
+  );
+}
+
+Map<String, dynamic>? _tryJws(String token) {
+  final parts = token.split('.');
+  if (parts.length != 3) return null;
+  try {
+    final normalized = base64Url.normalize(parts[1]);
+    final decoded = utf8.decode(base64Url.decode(normalized));
+    final obj = jsonDecode(decoded);
+    return obj is Map ? obj.cast<String, dynamic>() : null;
+  } on FormatException {
+    return null;
+  }
+}
+
+Item? _itemFromTowar(Map<String, dynamic> t, List<String> warnings) {
+  var name = (t['nazwa'] as String? ?? '').trim();
+  // Names end with the VAT rate letter, e.g. "Tonic                    A".
+  if (name.length > 2 &&
+      name[name.length - 2] == ' ' &&
+      RegExp(r'[A-G]$').hasMatch(name)) {
+    name = name.substring(0, name.length - 2).trim();
+  }
+  name = name.replaceAll(RegExp(r'\s+'), ' ');
+  if (name.isEmpty) return null;
+
+  final total = _asIntOrNull(t['brutto']);
+  if (total == null) {
+    warnings.add('Skipped "$name": missing brutto amount.');
+    return null;
+  }
+  final unit = _asIntOrNull(t['cena']) ?? 0;
+  final qty = _parseQty(t['ilosc']);
+  final rabat = t['rabat'];
+  final discount = rabat is Map ? (_asIntOrNull(rabat['wart']) ?? 0) : 0;
+
+  final lower = name.toLowerCase();
+  var category = Categories.general;
+  var assignment = Assignment();
+  if (_alcoholKeywords.any(lower.contains)) {
+    category = Categories.alcohol;
+    assignment = Assignment(mode: AssignMode.drinkers);
+  } else if (_mixerKeywords.any(lower.contains)) {
+    category = Categories.mixer; // still split among everyone by default
+  }
+
+  return Item(
+    id: Ids.next(),
+    name: name,
+    totalGr: total,
+    qty: qty,
+    unitPriceGr: unit,
+    discountGr: discount,
+    category: category,
+    assignment: assignment,
+  );
+}
+
+double _parseQty(dynamic v) {
+  if (v is num) return v.toDouble();
+  if (v is String) {
+    return double.tryParse(v.replaceAll(',', '.').trim()) ?? 1;
+  }
+  return 1;
+}
+
+int _asInt(dynamic v) => _asIntOrNull(v) ?? 0;
+
+int? _asIntOrNull(dynamic v) {
+  if (v is int) return v;
+  if (v is num) return v.round();
+  if (v is String) return int.tryParse(v);
+  return null;
+}

billsplit/lib/domain/models.dart

@@ -0,0 +1,278 @@
+/// Domain models. All money values are ints in grosze (1/100 PLN) to avoid
+/// floating point drift; formatting happens only at the UI/export edge.
+library;
+
+/// Formats [grosze] as a Polish złoty string, e.g. `1234` → `12,34 zł`.
+String formatPln(int grosze) {
+  final neg = grosze < 0;
+  final a = grosze.abs();
+  final zl = a ~/ 100;
+  final gr = (a % 100).toString().padLeft(2, '0');
+  return '${neg ? '-' : ''}$zl,$gr zł';
+}
+
+/// A person on the shared roster.
+class Person {
+  /// Creates a person; [drinks] controls alcohol-item defaults.
+  Person({required this.id, required this.name, this.drinks = true});
+
+  /// Restores a person from its [toJson] map.
+  factory Person.fromJson(Map<String, dynamic> j) => Person(
+        id: j['id'] as String,
+        name: j['name'] as String,
+        drinks: j['drinks'] as bool? ?? true,
+      );
+
+  /// Stable unique id.
+  final String id;
+
+  /// Display name.
+  String name;
+
+  /// Whether this person shares alcohol items by default.
+  bool drinks;
+
+  /// JSON representation for persistence.
+  Map<String, dynamic> toJson() => {'id': id, 'name': name, 'drinks': drinks};
+}
+
+/// A user-defined tag over roster members, e.g. "meat eaters".
+class Group {
+  /// Creates a group with optional initial [memberIds].
+  Group({required this.id, required this.name, Set<String>? memberIds})
+      : memberIds = memberIds ?? <String>{};
+
+  /// Restores a group from its [toJson] map.
+  factory Group.fromJson(Map<String, dynamic> j) => Group(
+        id: j['id'] as String,
+        name: j['name'] as String,
+        memberIds: (j['memberIds'] as List? ?? const <dynamic>[])
+            .cast<String>()
+            .toSet(),
+      );
+
+  /// Stable unique id.
+  final String id;
+
+  /// Display name.
+  String name;
+
+  /// Ids of [Person]s belonging to this group.
+  final Set<String> memberIds;
+
+  /// JSON representation for persistence.
+  Map<String, dynamic> toJson() =>
+      {'id': id, 'name': name, 'memberIds': memberIds.toList()};
+}
+
+/// How an item is assigned to people.
+enum AssignMode {
+  /// Everyone on the receipt shares the item.
+  everyone,
+
+  /// Only participants with [Person.drinks] set share the item.
+  drinkers,
+
+  /// Only participants without [Person.drinks] share the item.
+  nonDrinkers,
+
+  /// Members of one [Group] share the item.
+  group,
+
+  /// An explicit hand-picked set of people shares the item.
+  custom,
+}
+
+/// The assignment of one item: a symbolic mode plus mode-specific data.
+class Assignment {
+  /// Creates an assignment; defaults to [AssignMode.everyone].
+  Assignment({
+    this.mode = AssignMode.everyone,
+    this.groupId,
+    Set<String>? customIds,
+  }) : customIds = customIds ?? <String>{};
+
+  /// Restores an assignment from its [toJson] map.
+  factory Assignment.fromJson(Map<String, dynamic> j) => Assignment(
+        mode: AssignMode.values.asNameMap()[j['mode']] ?? AssignMode.everyone,
+        groupId: j['groupId'] as String?,
+        customIds: (j['customIds'] as List? ?? const <dynamic>[])
+            .cast<String>()
+            .toSet(),
+      );
+
+  /// Current mode.
+  AssignMode mode;
+
+  /// Group id when [mode] is [AssignMode.group].
+  String? groupId;
+
+  /// Hand-picked person ids when [mode] is [AssignMode.custom].
+  final Set<String> customIds;
+
+  /// JSON representation for persistence.
+  Map<String, dynamic> toJson() => {
+        'mode': mode.name,
+        if (groupId != null) 'groupId': groupId,
+        'customIds': customIds.toList(),
+      };
+}
+
+/// Standard item categories. [Item.category] is free text so users can add
+/// their own; these constants are the ones the importer produces.
+abstract final class Categories {
+  /// Alcoholic drinks — default to drinkers only.
+  static const alcohol = 'Alcohol';
+
+  /// Mixers (tonic, limes, …) — tagged for visibility, split among everyone.
+  static const mixer = 'Mixer';
+
+  /// Returnable bottle deposits (kaucja).
+  static const deposit = 'Deposit';
+
+  /// Anything else.
+  static const general = 'General';
+}
+
+/// One receipt line.
+class Item {
+  /// Creates an item; [totalGr] is the post-discount line total.
+  Item({
+    required this.id,
+    required this.name,
+    required this.totalGr,
+    this.qty = 1,
+    this.unitPriceGr = 0,
+    this.discountGr = 0,
+    this.category = Categories.general,
+    Assignment? assignment,
+  }) : assignment = assignment ?? Assignment();
+
+  /// Restores an item from its [toJson] map.
+  factory Item.fromJson(Map<String, dynamic> j) => Item(
+        id: j['id'] as String,
+        name: j['name'] as String,
+        totalGr: j['totalGr'] as int,
+        qty: (j['qty'] as num? ?? 1).toDouble(),
+        unitPriceGr: j['unitPriceGr'] as int? ?? 0,
+        discountGr: j['discountGr'] as int? ?? 0,
+        category: j['category'] as String? ?? Categories.general,
+        assignment: Assignment.fromJson(
+          (j['assignment'] as Map?)?.cast<String, dynamic>() ?? const {},
+        ),
+      );
+
+  /// Stable unique id.
+  final String id;
+
+  /// Display name.
+  String name;
+
+  /// Final line total after discount — the ground truth used for splitting.
+  int totalGr;
+
+  /// Quantity (may be fractional for weighed goods).
+  double qty;
+
+  /// Unit price in grosze.
+  int unitPriceGr;
+
+  /// Discount already included in [totalGr]; kept for display (<= 0).
+  int discountGr;
+
+  /// Free-text category; see [Categories] for the standard values.
+  String category;
+
+  /// Who shares this item.
+  Assignment assignment;
+
+  /// JSON representation for persistence.
+  Map<String, dynamic> toJson() => {
+        'id': id,
+        'name': name,
+        'totalGr': totalGr,
+        'qty': qty,
+        'unitPriceGr': unitPriceGr,
+        'discountGr': discountGr,
+        'category': category,
+        'assignment': assignment.toJson(),
+      };
+}
+
+/// One shopping receipt with its items and participants.
+class Receipt {
+  /// Creates a receipt; [participantIds] defaults to empty.
+  Receipt({
+    required this.id,
+    required this.title,
+    this.store,
+    DateTime? date,
+    List<Item>? items,
+    Set<String>? participantIds,
+    this.paidTotalGr,
+  })  : date = date ?? DateTime.now(),
+        items = items ?? <Item>[],
+        participantIds = participantIds ?? <String>{};
+
+  /// Restores a receipt from its [toJson] map.
+  factory Receipt.fromJson(Map<String, dynamic> j) => Receipt(
+        id: j['id'] as String,
+        title: j['title'] as String,
+        store: j['store'] as String?,
+        date: DateTime.tryParse(j['date'] as String? ?? '') ?? DateTime.now(),
+        items: (j['items'] as List? ?? const <dynamic>[])
+            .map((e) => Item.fromJson((e as Map).cast<String, dynamic>()))
+            .toList(),
+        participantIds: (j['participantIds'] as List? ?? const <dynamic>[])
+            .cast<String>()
+            .toSet(),
+        paidTotalGr: j['paidTotalGr'] as int?,
+      );
+
+  /// Stable unique id.
+  final String id;
+
+  /// Display title.
+  String title;
+
+  /// Store name, if known.
+  String? store;
+
+  /// Sale date.
+  DateTime date;
+
+  /// Line items.
+  final List<Item> items;
+
+  /// Subset of the roster taking part in this receipt.
+  final Set<String> participantIds;
+
+  /// What was actually paid (incl. deposits) — used for the reconciliation
+  /// check. Null for manual receipts where the user never entered it.
+  int? paidTotalGr;
+
+  /// Sum of all item totals in grosze.
+  int get itemsTotalGr => items.fold(0, (s, i) => s + i.totalGr);
+
+  /// JSON representation for persistence.
+  Map<String, dynamic> toJson() => {
+        'id': id,
+        'title': title,
+        'store': store,
+        'date': date.toIso8601String(),
+        'items': items.map((i) => i.toJson()).toList(),
+        'participantIds': participantIds.toList(),
+        'paidTotalGr': paidTotalGr,
+      };
+}
+
+/// Simple unique id source: time + counter. Good enough for a local,
+/// single-user app.
+class Ids {
+  static int _c = 0;
+
+  /// Returns a new unique id.
+  static String next() =>
+      '${DateTime.now().microsecondsSinceEpoch.toRadixString(36)}'
+      '-${(_c++).toRadixString(36)}';
+}

billsplit/lib/domain/split_engine.dart

@@ -0,0 +1,155 @@
+/// Split computation. Grosz-exact: every item's shares sum to exactly the
+/// item total (largest-remainder distribution, deterministic order), so the
+/// per-person totals always reconcile with the receipt to the grosz.
+library;
+
+import 'package:billsplit/domain/models.dart';
+
+/// Accumulated amounts one person owes on a receipt.
+class PersonTotal {
+  /// Creates an empty total for [personId].
+  PersonTotal(this.personId);
+
+  /// The person this total belongs to.
+  final String personId;
+
+  /// Everything owed, in grosze.
+  int totalGr = 0;
+
+  /// The alcohol portion of [totalGr].
+  int alcoholGr = 0;
+
+  /// The non-alcohol portion of [totalGr].
+  int get restGr => totalGr - alcoholGr;
+}
+
+/// Result of [computeSplit].
+class SplitResult {
+  /// Bundles the computed maps.
+  SplitResult({
+    required this.perPerson,
+    required this.itemShares,
+    required this.unassigned,
+  });
+
+  /// personId → totals. Contains every receipt participant, even if 0.
+  final Map<String, PersonTotal> perPerson;
+
+  /// itemId → (personId → share in grosze). Only resolved participants.
+  final Map<String, Map<String, int>> itemShares;
+
+  /// Items that resolved to zero participants (excluded from totals).
+  final List<Item> unassigned;
+
+  /// Sum of all per-person totals, in grosze.
+  int get assignedTotalGr => perPerson.values.fold(0, (s, p) => s + p.totalGr);
+}
+
+/// People from [Receipt.participantIds] that still exist in [roster].
+List<Person> receiptParticipants(Receipt receipt, List<Person> roster) =>
+    roster.where((p) => receipt.participantIds.contains(p.id)).toList();
+
+/// Resolves an item's assignment to concrete people, always intersected with
+/// the receipt's participant pool.
+List<Person> resolveParticipants(
+  Item item,
+  Receipt receipt,
+  List<Person> roster,
+  List<Group> groups,
+) {
+  final pool = receiptParticipants(receipt, roster);
+  final a = item.assignment;
+  switch (a.mode) {
+    case AssignMode.everyone:
+      return pool;
+    case AssignMode.drinkers:
+      return pool.where((p) => p.drinks).toList();
+    case AssignMode.nonDrinkers:
+      return pool.where((p) => !p.drinks).toList();
+    case AssignMode.group:
+      final g = groups.where((g) => g.id == a.groupId).firstOrNull;
+      if (g == null) return const [];
+      return pool.where((p) => g.memberIds.contains(p.id)).toList();
+    case AssignMode.custom:
+      return pool.where((p) => a.customIds.contains(p.id)).toList();
+  }
+}
+
+/// Splits [totalGr] between [personIds]. Base share is floor(total/n); the
+/// remainder is handed out one grosz at a time starting at a position derived
+/// from [rotation] (e.g. a stable hash of the item id). Rotating the start
+/// per item avoids systematically overcharging the same person across a whole
+/// receipt, while staying fully deterministic. Shares always sum to exactly
+/// [totalGr] (also for negative totals, e.g. returns).
+Map<String, int> splitAmount(
+  int totalGr,
+  List<String> personIds, {
+  int rotation = 0,
+}) {
+  if (personIds.isEmpty) return const {};
+  final ids = [...personIds]..sort();
+  final n = ids.length;
+  final base = (totalGr / n).floor();
+  final remainder = totalGr - base * n; // 0 <= remainder < n, also if negative
+  final start = ((rotation % n) + n) % n;
+  final out = <String, int>{for (final id in ids) id: base};
+  for (var k = 0; k < remainder; k++) {
+    out[ids[(start + k) % n]] = base + 1;
+  }
+  return out;
+}
+
+/// Stable string hash (unlike `String.hashCode`, which is not guaranteed
+/// identical across Dart VM runs) so splits don't shift between app launches.
+int stableHash(String s) {
+  var h = 0;
+  for (final c in s.codeUnits) {
+    h = (h * 31 + c) & 0x7fffffff;
+  }
+  return h;
+}
+
+/// Computes the full split of [receipt] between [roster] members using
+/// [groups] for group-mode assignments.
+SplitResult computeSplit(
+  Receipt receipt,
+  List<Person> roster,
+  List<Group> groups,
+) {
+  final perPerson = <String, PersonTotal>{
+    for (final p in receiptParticipants(receipt, roster))
+      p.id: PersonTotal(p.id),
+  };
+  final itemShares = <String, Map<String, int>>{};
+  final unassigned = <Item>[];
+
+  for (final item in receipt.items) {
+    final people = resolveParticipants(item, receipt, roster, groups);
+    if (people.isEmpty) {
+      unassigned.add(item);
+      continue;
+    }
+    final shares = splitAmount(
+      item.totalGr,
+      people.map((p) => p.id).toList(),
+      rotation: stableHash(item.id),
+    );
+    itemShares[item.id] = shares;
+    final isAlcohol = item.category == Categories.alcohol;
+    shares.forEach((pid, amount) {
+      perPerson[pid]!
+        ..totalGr += amount
+        ..alcoholGr += isAlcohol ? amount : 0;
+    });
+  }
+
+  return SplitResult(
+    perPerson: perPerson,
+    itemShares: itemShares,
+    unassigned: unassigned,
+  );
+}
+
+extension<T> on Iterable<T> {
+  T? get firstOrNull => isEmpty ? null : first;
+}

billsplit/lib/domain/xlsx_export.dart

@@ -0,0 +1,215 @@
+/// Exports a receipt + computed split to an .xlsx workbook whose layout
+/// mirrors the hand-made "podzial_rachunku" sheet: one row per item, a 1/0
+/// person matrix, per-item cost-per-person, and a per-person summary.
+///
+/// Values are written as computed numbers (grosz-exact, matching the in-app
+/// engine), plus live SUM formulas for the column totals so the sheet stays
+/// consistent when opened in Excel/LibreOffice.
+library;
+
+import 'package:billsplit/domain/models.dart';
+import 'package:billsplit/domain/split_engine.dart';
+import 'package:excel/excel.dart';
+
+/// Renders [receipt] with its current split into xlsx bytes.
+List<int> exportXlsx({
+  required Receipt receipt,
+  required List<Person> roster,
+  required List<Group> groups,
+}) {
+  final excel = Excel.createExcel()..rename('Sheet1', 'Split');
+  final sheet = excel['Split'];
+
+  final people = receiptParticipants(receipt, roster)
+    ..sort((a, b) => a.name.toLowerCase().compareTo(b.name.toLowerCase()));
+  final split = computeSplit(receipt, roster, groups);
+
+  final bold = CellStyle(bold: true);
+  final boldGrey = CellStyle(
+    bold: true,
+    backgroundColorHex: ExcelColor.fromHexString('#D9D9D9'),
+  );
+  final alcoholStyle =
+      CellStyle(backgroundColorHex: ExcelColor.fromHexString('#FCE4D6'));
+  final warnStyle = CellStyle(
+    bold: true,
+    backgroundColorHex: ExcelColor.fromHexString('#FFC7CE'),
+  );
+
+  void put(int col, int row, CellValue value, [CellStyle? style]) {
+    final index = CellIndex.indexByColumnRow(columnIndex: col, rowIndex: row);
+    final cell = sheet.cell(index)..value = value;
+    if (style != null) cell.cellStyle = style;
+  }
+
+  double zl(int gr) => gr / 100.0;
+
+  var r = 0;
+  put(0, r, TextCellValue(receipt.title), bold);
+  r++;
+  put(
+    0,
+    r,
+    TextCellValue(
+      [
+        if (receipt.store != null) receipt.store!,
+        receipt.date.toIso8601String().substring(0, 10),
+        if (receipt.paidTotalGr != null)
+          'paid ${formatPln(receipt.paidTotalGr!)}',
+      ].join(' · '),
+    ),
+  );
+  r += 2;
+
+  // Header row.
+  const fixed = ['Lp', 'Item', 'Category', 'Qty', 'Unit', 'Discount', 'Total'];
+  for (var c = 0; c < fixed.length; c++) {
+    put(c, r, TextCellValue(fixed[c]), boldGrey);
+  }
+  const p0 = 7;
+  for (var i = 0; i < people.length; i++) {
+    put(p0 + i, r, TextCellValue(people[i].name), boldGrey);
+  }
+  put(p0 + people.length, r, TextCellValue('People on item'), boldGrey);
+  put(p0 + people.length + 1, r, TextCellValue('Cost / person'), boldGrey);
+  r++;
+
+  final firstDataRow = r;
+  var lp = 1;
+  for (final item in receipt.items) {
+    final shares = split.itemShares[item.id] ?? const <String, int>{};
+    final isAlcohol = item.category == Categories.alcohol;
+    final rowStyle = shares.isEmpty
+        ? warnStyle
+        : isAlcohol
+            ? alcoholStyle
+            : null;
+    put(0, r, IntCellValue(lp++), rowStyle);
+    put(1, r, TextCellValue(item.name), rowStyle);
+    put(2, r, TextCellValue(item.category), rowStyle);
+    put(3, r, DoubleCellValue(item.qty), rowStyle);
+    put(4, r, DoubleCellValue(zl(item.unitPriceGr)), rowStyle);
+    put(5, r, DoubleCellValue(zl(item.discountGr)), rowStyle);
+    put(6, r, DoubleCellValue(zl(item.totalGr)), rowStyle);
+    for (var i = 0; i < people.length; i++) {
+      put(
+        p0 + i,
+        r,
+        IntCellValue(shares.containsKey(people[i].id) ? 1 : 0),
+        rowStyle,
+      );
+    }
+    put(p0 + people.length, r, IntCellValue(shares.length), rowStyle);
+    if (shares.isNotEmpty) {
+      // Representative value; the exact grosz split may differ by ±0.01
+      // between people — the summary uses the exact per-person numbers.
+      put(
+        p0 + people.length + 1,
+        r,
+        DoubleCellValue(zl((item.totalGr / shares.length).round())),
+        rowStyle,
+      );
+    } else {
+      put(p0 + people.length + 1, r, TextCellValue('UNASSIGNED'), warnStyle);
+    }
+    r++;
+  }
+  final lastDataRow = r - 1;
+
+  // Totals row with a live formula over the Total column.
+  put(1, r, TextCellValue('TOTAL'), bold);
+  final totalCol = colName(6);
+  put(
+    6,
+    r,
+    FormulaCellValue(
+      'SUM($totalCol${firstDataRow + 1}:$totalCol${lastDataRow + 1})',
+    ),
+    bold,
+  );
+  r += 2;
+
+  // Per-person summary (exact grosz numbers from the engine).
+  put(1, r, TextCellValue('SUMMARY'), bold);
+  r++;
+  put(1, r, TextCellValue('Person'), boldGrey);
+  put(2, r, TextCellValue('Owes'), boldGrey);
+  put(3, r, TextCellValue('of which alcohol'), boldGrey);
+  put(4, r, TextCellValue('rest'), boldGrey);
+  r++;
+  final firstSummaryRow = r;
+  for (final p in people) {
+    final t = split.perPerson[p.id];
+    put(1, r, TextCellValue(p.name + (p.drinks ? '' : ' (non-drinker)')));
+    put(2, r, DoubleCellValue(zl(t?.totalGr ?? 0)));
+    put(3, r, DoubleCellValue(zl(t?.alcoholGr ?? 0)));
+    put(4, r, DoubleCellValue(zl(t?.restGr ?? 0)));
+    r++;
+  }
+  put(1, r, TextCellValue('SUM'), bold);
+  for (var c = 2; c <= 4; c++) {
+    final col = colName(c);
+    put(c, r, FormulaCellValue('SUM($col$firstSummaryRow:$col$r)'), bold);
+  }
+  r += 2;
+
+  // Reconciliation note.
+  final assigned = split.assignedTotalGr;
+  final itemsTotal = receipt.itemsTotalGr;
+  put(
+    1,
+    r,
+    TextCellValue(
+      _checkLine(receipt, assigned, itemsTotal, split),
+    ),
+    split.unassigned.isEmpty && assigned == itemsTotal ? bold : warnStyle,
+  );
+  r += 2;
+  put(
+    0,
+    r,
+    TextCellValue(
+      '1 = person shares the item. Matrix and summary are exported values '
+      'from the app (grosz-exact); edit splits in the app, not here.',
+    ),
+  );
+
+  // Column widths.
+  sheet
+    ..setColumnWidth(0, 5)
+    ..setColumnWidth(1, 34)
+    ..setColumnWidth(2, 11);
+  for (var c = 3; c < 7; c++) {
+    sheet.setColumnWidth(c, 10);
+  }
+  for (var i = 0; i < people.length + 2; i++) {
+    sheet.setColumnWidth(p0 + i, 12);
+  }
+
+  return excel.encode()!;
+}
+
+String _checkLine(
+  Receipt receipt,
+  int assigned,
+  int itemsTotal,
+  SplitResult split,
+) {
+  final paid = receipt.paidTotalGr;
+  final paidPart = paid == null ? '' : ' / paid ${formatPln(paid)}';
+  final un = split.unassigned.length;
+  final unPart = un == 0 ? '' : ' — $un UNASSIGNED item(s) excluded';
+  return 'Check: assigned ${formatPln(assigned)} '
+      '/ items ${formatPln(itemsTotal)}$paidPart$unPart';
+}
+
+/// Converts a 0-based column index into its A1-style name (0 → A, 26 → AA).
+String colName(int index) {
+  var i = index;
+  var s = '';
+  while (i >= 0) {
+    s = String.fromCharCode(65 + (i % 26)) + s;
+    i = i ~/ 26 - 1;
+  }
+  return s;
+}

billsplit/lib/main.dart

@@ -0,0 +1,37 @@
+import 'dart:async';
+
+import 'package:billsplit/state/app_state.dart';
+import 'package:billsplit/ui/home_screen.dart';
+import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+
+void main() {
+  WidgetsFlutterBinding.ensureInitialized();
+  final state = AppState();
+  unawaited(state.load());
+  runApp(BillSplitApp(state: state));
+}
+
+/// Root widget wiring [AppState] into the tree.
+class BillSplitApp extends StatelessWidget {
+  /// Creates the app around an existing [state].
+  const BillSplitApp({required this.state, super.key});
+
+  /// The single app-wide state instance.
+  final AppState state;
+
+  @override
+  Widget build(BuildContext context) {
+    return ChangeNotifierProvider.value(
+      value: state,
+      child: MaterialApp(
+        title: 'BillSplit',
+        debugShowCheckedModeBanner: false,
+        theme: ThemeData(
+          colorScheme: ColorScheme.fromSeed(seedColor: Colors.teal),
+        ),
+        home: const HomeScreen(),
+      ),
+    );
+  }
+}

billsplit/lib/state/app_state.dart

@@ -0,0 +1,166 @@
+import 'dart:async';
+import 'dart:convert';
+import 'dart:io';
+
+import 'package:billsplit/domain/models.dart';
+import 'package:flutter/foundation.dart';
+import 'package:path_provider/path_provider.dart';
+
+/// Single source of truth: roster, groups, receipts. Persisted as one JSON
+/// file in the app documents directory; saves are debounced.
+class AppState extends ChangeNotifier {
+  /// Creates the state; [overrideDir] replaces the platform documents
+  /// directory (used by tests).
+  AppState({Directory? overrideDir}) : _overrideDir = overrideDir;
+
+  final Directory? _overrideDir;
+
+  /// The shared roster of people.
+  final List<Person> people = [];
+
+  /// User-defined groups over [people].
+  final List<Group> groups = [];
+
+  /// Saved receipts, newest first.
+  final List<Receipt> receipts = [];
+
+  /// Whether [load] has completed.
+  bool loaded = false;
+
+  Timer? _saveTimer;
+
+  Future<File> _file() async {
+    final dir = _overrideDir ?? await getApplicationDocumentsDirectory();
+    final d = Directory('${dir.path}/billsplit');
+    if (!d.existsSync()) d.createSync(recursive: true);
+    return File('${d.path}/state.json');
+  }
+
+  /// Loads persisted state; failures leave the state empty but usable.
+  Future<void> load() async {
+    try {
+      final f = await _file();
+      if (f.existsSync()) {
+        final j = jsonDecode(f.readAsStringSync()) as Map<String, dynamic>;
+        people
+          ..clear()
+          ..addAll(
+            (j['people'] as List? ?? const <dynamic>[])
+                .map((e) => Person.fromJson((e as Map).cast())),
+          );
+        groups
+          ..clear()
+          ..addAll(
+            (j['groups'] as List? ?? const <dynamic>[])
+                .map((e) => Group.fromJson((e as Map).cast())),
+          );
+        receipts
+          ..clear()
+          ..addAll(
+            (j['receipts'] as List? ?? const <dynamic>[])
+                .map((e) => Receipt.fromJson((e as Map).cast())),
+          );
+        _prune();
+      }
+    } on FormatException catch (e) {
+      debugPrint('State load failed (corrupt JSON): $e');
+    } on FileSystemException catch (e) {
+      debugPrint('State load failed (IO): $e');
+    }
+    loaded = true;
+    notifyListeners();
+  }
+
+  /// Drop references to people that no longer exist.
+  void _prune() {
+    final ids = people.map((p) => p.id).toSet();
+    for (final g in groups) {
+      g.memberIds.removeWhere((id) => !ids.contains(id));
+    }
+    for (final r in receipts) {
+      r.participantIds.removeWhere((id) => !ids.contains(id));
+      for (final i in r.items) {
+        i.assignment.customIds.removeWhere((id) => !ids.contains(id));
+      }
+    }
+  }
+
+  void _scheduleSave() {
+    _saveTimer?.cancel();
+    _saveTimer = Timer(const Duration(milliseconds: 400), save);
+  }
+
+  /// Writes the current state to disk immediately.
+  Future<void> save() async {
+    try {
+      final f = await _file();
+      f.writeAsStringSync(
+        jsonEncode({
+          'people': people.map((p) => p.toJson()).toList(),
+          'groups': groups.map((g) => g.toJson()).toList(),
+          'receipts': receipts.map((r) => r.toJson()).toList(),
+        }),
+      );
+    } on FileSystemException catch (e) {
+      debugPrint('State save failed: $e');
+    }
+  }
+
+  /// Runs [fn], prunes dangling references, notifies, schedules a save.
+  void mutate(void Function() fn) {
+    fn();
+    _prune();
+    notifyListeners();
+    _scheduleSave();
+  }
+
+  // Convenience CRUD -------------------------------------------------------
+
+  /// Adds a person to the roster and returns it.
+  Person addPerson(String name, {bool drinks = true}) {
+    final p = Person(id: Ids.next(), name: name, drinks: drinks);
+    mutate(() => people.add(p));
+    return p;
+  }
+
+  /// Removes [p] everywhere (roster, groups, receipts, assignments).
+  void removePerson(Person p) => mutate(() => people.remove(p));
+
+  /// Adds an empty group and returns it.
+  Group addGroup(String name) {
+    final g = Group(id: Ids.next(), name: name);
+    mutate(() => groups.add(g));
+    return g;
+  }
+
+  /// Removes [g]; items assigned to it fall back to everyone.
+  void removeGroup(Group g) => mutate(() {
+        groups.remove(g);
+        for (final r in receipts) {
+          for (final i in r.items) {
+            if (i.assignment.groupId == g.id) {
+              i.assignment
+                ..mode = AssignMode.everyone
+                ..groupId = null;
+            }
+          }
+        }
+      });
+
+  /// Inserts [r] at the top; empty participants default to the whole roster.
+  void addReceipt(Receipt r) => mutate(() {
+        if (r.participantIds.isEmpty) {
+          r.participantIds.addAll(people.map((p) => p.id));
+        }
+        receipts.insert(0, r);
+      });
+
+  /// Deletes [r].
+  void removeReceipt(Receipt r) => mutate(() => receipts.remove(r));
+
+  @override
+  void dispose() {
+    _saveTimer?.cancel();
+    super.dispose();
+  }
+}

billsplit/lib/ui/assignment_sheet.dart

@@ -0,0 +1,143 @@
+import 'package:billsplit/domain/models.dart';
+import 'package:billsplit/domain/split_engine.dart';
+import 'package:billsplit/state/app_state.dart';
+import 'package:flutter/material.dart';
+
+/// Bottom sheet to assign an item: quick modes (everyone / drinkers /
+/// non-drinkers / group) or explicit person selection. Toggling a person
+/// checkbox on a non-custom mode first materializes the current selection,
+/// then switches to custom.
+Future<void> showAssignmentSheet(
+  BuildContext context,
+  AppState state,
+  Receipt receipt,
+  Item item,
+) {
+  return showModalBottomSheet<void>(
+    context: context,
+    isScrollControlled: true,
+    builder: (c) => StatefulBuilder(
+      builder: (c, setSheet) {
+        final pool = receiptParticipants(receipt, state.people)
+          ..sort(
+            (a, b) => a.name.toLowerCase().compareTo(b.name.toLowerCase()),
+          );
+        final resolved =
+            resolveParticipants(item, receipt, state.people, state.groups)
+                .map((p) => p.id)
+                .toSet();
+
+        void setMode(AssignMode mode, {String? groupId}) {
+          state.mutate(() {
+            item.assignment
+              ..mode = mode
+              ..groupId = groupId;
+          });
+          setSheet(() {});
+        }
+
+        void togglePerson(Person p, {required bool selected}) {
+          state.mutate(() {
+            if (item.assignment.mode != AssignMode.custom) {
+              item.assignment
+                ..customIds.clear()
+                ..customIds.addAll(resolved)
+                ..mode = AssignMode.custom
+                ..groupId = null;
+            }
+            if (selected) {
+              item.assignment.customIds.add(p.id);
+            } else {
+              item.assignment.customIds.remove(p.id);
+            }
+          });
+          setSheet(() {});
+        }
+
+        final selectedSeg = switch (item.assignment.mode) {
+          AssignMode.everyone => 'everyone',
+          AssignMode.drinkers => 'drinkers',
+          AssignMode.nonDrinkers => 'nonDrinkers',
+          AssignMode.group => 'group:${item.assignment.groupId}',
+          AssignMode.custom => 'custom',
+        };
+
+        return SafeArea(
+          child: Padding(
+            padding: const EdgeInsets.all(16),
+            child: Column(
+              mainAxisSize: MainAxisSize.min,
+              crossAxisAlignment: CrossAxisAlignment.start,
+              children: [
+                Text(item.name, style: Theme.of(c).textTheme.titleMedium),
+                Text(
+                  '${formatPln(item.totalGr)} · ${item.category}',
+                  style: Theme.of(c).textTheme.bodySmall,
+                ),
+                const SizedBox(height: 12),
+                Wrap(
+                  spacing: 8,
+                  runSpacing: 8,
+                  children: [
+                    ChoiceChip(
+                      label: const Text('Everyone'),
+                      selected: selectedSeg == 'everyone',
+                      onSelected: (_) => setMode(AssignMode.everyone),
+                    ),
+                    ChoiceChip(
+                      label: const Text('Drinkers'),
+                      selected: selectedSeg == 'drinkers',
+                      onSelected: (_) => setMode(AssignMode.drinkers),
+                    ),
+                    ChoiceChip(
+                      label: const Text('Non-drinkers'),
+                      selected: selectedSeg == 'nonDrinkers',
+                      onSelected: (_) => setMode(AssignMode.nonDrinkers),
+                    ),
+                    for (final g in state.groups)
+                      ChoiceChip(
+                        label: Text(g.name),
+                        selected: selectedSeg == 'group:${g.id}',
+                        onSelected: (_) =>
+                            setMode(AssignMode.group, groupId: g.id),
+                      ),
+                  ],
+                ),
+                const SizedBox(height: 8),
+                Flexible(
+                  child: ListView(
+                    shrinkWrap: true,
+                    children: [
+                      for (final p in pool)
+                        CheckboxListTile(
+                          dense: true,
+                          title: Text(p.name),
+                          subtitle: p.drinks ? null : const Text('non-drinker'),
+                          value: resolved.contains(p.id),
+                          onChanged: (v) =>
+                              togglePerson(p, selected: v ?? false),
+                        ),
+                    ],
+                  ),
+                ),
+                Text(
+                  resolved.isEmpty
+                      ? 'Nobody selected — this item will be excluded from '
+                          'totals until someone is assigned.'
+                      : _eachLabel(resolved.length, item.totalGr),
+                  style: TextStyle(
+                    color: resolved.isEmpty ? Colors.red : Colors.black54,
+                    fontSize: 12,
+                  ),
+                ),
+              ],
+            ),
+          ),
+        );
+      },
+    ),
+  );
+}
+
+String _eachLabel(int n, int totalGr) =>
+    '$n people · ~${formatPln((totalGr / n).round())} each';

billsplit/lib/ui/home_screen.dart

@@ -0,0 +1,208 @@
+import 'dart:async';
+import 'dart:convert';
+
+import 'package:billsplit/domain/eparagon_parser.dart';
+import 'package:billsplit/domain/models.dart';
+import 'package:billsplit/state/app_state.dart';
+import 'package:billsplit/ui/people_screen.dart';
+import 'package:billsplit/ui/receipt_screen.dart';
+import 'package:file_picker/file_picker.dart';
+import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+
+/// Receipt list plus entry points for import / manual creation.
+class HomeScreen extends StatelessWidget {
+  /// Creates the home screen.
+  const HomeScreen({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    final state = context.watch<AppState>();
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('BillSplit'),
+        actions: [
+          IconButton(
+            tooltip: 'People & groups',
+            icon: const Icon(Icons.group),
+            onPressed: () => unawaited(
+              Navigator.push(
+                context,
+                MaterialPageRoute<void>(builder: (_) => const PeopleScreen()),
+              ),
+            ),
+          ),
+        ],
+      ),
+      body: !state.loaded
+          ? const Center(child: CircularProgressIndicator())
+          : state.receipts.isEmpty
+              ? const _EmptyHint()
+              : ListView.builder(
+                  itemCount: state.receipts.length,
+                  itemBuilder: (context, i) {
+                    final r = state.receipts[i];
+                    return Dismissible(
+                      key: ValueKey(r.id),
+                      direction: DismissDirection.endToStart,
+                      background: Container(
+                        color: Colors.red.shade300,
+                        alignment: Alignment.centerRight,
+                        padding: const EdgeInsets.only(right: 16),
+                        child: const Icon(Icons.delete, color: Colors.white),
+                      ),
+                      confirmDismiss: (_) => _confirmDelete(context, r),
+                      onDismissed: (_) => state.removeReceipt(r),
+                      child: ListTile(
+                        title: Text(r.title),
+                        subtitle: Text(
+                          '${r.items.length} items · '
+                          '${r.participantIds.length} people',
+                        ),
+                        trailing: Text(
+                          formatPln(r.itemsTotalGr),
+                          style: Theme.of(context).textTheme.titleMedium,
+                        ),
+                        onTap: () => unawaited(
+                          Navigator.push(
+                            context,
+                            MaterialPageRoute<void>(
+                              builder: (_) => ReceiptScreen(receiptId: r.id),
+                            ),
+                          ),
+                        ),
+                      ),
+                    );
+                  },
+                ),
+      floatingActionButton: Column(
+        mainAxisSize: MainAxisSize.min,
+        crossAxisAlignment: CrossAxisAlignment.end,
+        children: [
+          FloatingActionButton.extended(
+            heroTag: 'import',
+            icon: const Icon(Icons.file_download),
+            label: const Text('Import e-paragon'),
+            onPressed: () => _import(context),
+          ),
+          const SizedBox(height: 12),
+          FloatingActionButton.extended(
+            heroTag: 'new',
+            icon: const Icon(Icons.add),
+            label: const Text('New receipt'),
+            onPressed: () => _createManual(context),
+          ),
+        ],
+      ),
+    );
+  }
+
+  Future<bool> _confirmDelete(BuildContext context, Receipt r) async {
+    return await showDialog<bool>(
+          context: context,
+          builder: (c) => AlertDialog(
+            title: const Text('Delete receipt?'),
+            content: Text('"${r.title}" will be removed permanently.'),
+            actions: [
+              TextButton(
+                onPressed: () => Navigator.pop(c, false),
+                child: const Text('Cancel'),
+              ),
+              FilledButton(
+                onPressed: () => Navigator.pop(c, true),
+                child: const Text('Delete'),
+              ),
+            ],
+          ),
+        ) ??
+        false;
+  }
+
+  Future<void> _import(BuildContext context) async {
+    final state = context.read<AppState>();
+    final messenger = ScaffoldMessenger.of(context);
+    final nav = Navigator.of(context);
+    final picked = await FilePicker.pickFiles(
+      type: FileType.custom,
+      allowedExtensions: ['json'],
+      withData: true,
+    );
+    final data = picked?.files.firstOrNull?.bytes;
+    if (data == null) return;
+    try {
+      final result = parseEParagonDetailed(utf8.decode(data));
+      state.addReceipt(result.receipt);
+      for (final w in result.warnings) {
+        messenger.showSnackBar(SnackBar(content: Text(w)));
+      }
+      unawaited(
+        nav.push(
+          MaterialPageRoute<void>(
+            builder: (_) => ReceiptScreen(receiptId: result.receipt.id),
+          ),
+        ),
+      );
+    } on EParagonParseException catch (e) {
+      messenger.showSnackBar(SnackBar(content: Text(e.message)));
+    } on Exception catch (e) {
+      messenger.showSnackBar(SnackBar(content: Text('Import failed: $e')));
+    }
+  }
+
+  Future<void> _createManual(BuildContext context) async {
+    final state = context.read<AppState>();
+    final nav = Navigator.of(context);
+    final controller = TextEditingController();
+    final title = await showDialog<String>(
+      context: context,
+      builder: (c) => AlertDialog(
+        title: const Text('New receipt'),
+        content: TextField(
+          controller: controller,
+          autofocus: true,
+          decoration: const InputDecoration(labelText: 'Title'),
+          onSubmitted: (v) => Navigator.pop(c, v),
+        ),
+        actions: [
+          TextButton(
+            onPressed: () => Navigator.pop(c),
+            child: const Text('Cancel'),
+          ),
+          FilledButton(
+            onPressed: () => Navigator.pop(c, controller.text),
+            child: const Text('Create'),
+          ),
+        ],
+      ),
+    );
+    if (title == null || title.trim().isEmpty) return;
+    final r = Receipt(id: Ids.next(), title: title.trim());
+    state.addReceipt(r);
+    unawaited(
+      nav.push(
+        MaterialPageRoute<void>(
+          builder: (_) => ReceiptScreen(receiptId: r.id),
+        ),
+      ),
+    );
+  }
+}
+
+class _EmptyHint extends StatelessWidget {
+  const _EmptyHint();
+
+  @override
+  Widget build(BuildContext context) {
+    return Center(
+      child: Padding(
+        padding: const EdgeInsets.all(32),
+        child: Text(
+          'No receipts yet.\n\nAdd people first (top right), then import a '
+          'Biedronka e-paragon JSON or create a receipt manually.',
+          textAlign: TextAlign.center,
+          style: Theme.of(context).textTheme.bodyLarge,
+        ),
+      ),
+    );
+  }
+}

billsplit/lib/ui/item_edit.dart

@@ -0,0 +1,130 @@
+import 'package:billsplit/domain/models.dart';
+import 'package:billsplit/state/app_state.dart';
+import 'package:flutter/material.dart';
+
+/// Add ([item] == null) or edit an item. The user types amounts in złoty
+/// ("12,34" or "12.34"); they are stored as int grosze.
+Future<void> showItemEditDialog(
+  BuildContext context,
+  AppState state,
+  Receipt receipt,
+  Item? item,
+) async {
+  final name = TextEditingController(text: item?.name ?? '');
+  final total = TextEditingController(
+    text: item == null ? '' : _zl(item.totalGr),
+  );
+  final qty = TextEditingController(text: (item?.qty ?? 1).toString());
+  var category = item?.category ?? Categories.general;
+  final categories = <String>{
+    Categories.general,
+    Categories.alcohol,
+    Categories.mixer,
+    Categories.deposit,
+    ...receipt.items.map((i) => i.category),
+  }.toList();
+
+  await showDialog<void>(
+    context: context,
+    builder: (c) => StatefulBuilder(
+      builder: (c, setState) => AlertDialog(
+        title: Text(item == null ? 'Add item' : 'Edit item'),
+        content: SingleChildScrollView(
+          child: Column(
+            mainAxisSize: MainAxisSize.min,
+            children: [
+              TextField(
+                controller: name,
+                autofocus: item == null,
+                decoration: const InputDecoration(labelText: 'Name'),
+              ),
+              TextField(
+                controller: total,
+                keyboardType:
+                    const TextInputType.numberWithOptions(decimal: true),
+                decoration: const InputDecoration(
+                  labelText: 'Total (zł)',
+                  hintText: 'e.g. 12,34',
+                ),
+              ),
+              TextField(
+                controller: qty,
+                keyboardType:
+                    const TextInputType.numberWithOptions(decimal: true),
+                decoration: const InputDecoration(labelText: 'Quantity'),
+              ),
+              const SizedBox(height: 8),
+              DropdownButtonFormField<String>(
+                initialValue: category,
+                decoration: const InputDecoration(labelText: 'Category'),
+                items: [
+                  for (final cat in categories)
+                    DropdownMenuItem(value: cat, child: Text(cat)),
+                ],
+                onChanged: (v) =>
+                    setState(() => category = v ?? Categories.general),
+              ),
+              const SizedBox(height: 4),
+              const Text(
+                'Alcohol items default to drinkers only; everything else to '
+                'everyone. Fine-tune by tapping the item afterwards.',
+                style: TextStyle(fontSize: 11, color: Colors.black54),
+              ),
+            ],
+          ),
+        ),
+        actions: [
+          if (item != null)
+            TextButton(
+              onPressed: () {
+                state.mutate(() => receipt.items.remove(item));
+                Navigator.pop(c);
+              },
+              child: const Text('Delete', style: TextStyle(color: Colors.red)),
+            ),
+          TextButton(
+            onPressed: () => Navigator.pop(c),
+            child: const Text('Cancel'),
+          ),
+          FilledButton(
+            onPressed: () {
+              final gr = _parseZl(total.text);
+              if (name.text.trim().isEmpty || gr == null) return;
+              state.mutate(() {
+                if (item == null) {
+                  final it = Item(
+                    id: Ids.next(),
+                    name: name.text.trim(),
+                    totalGr: gr,
+                    qty: double.tryParse(qty.text.replaceAll(',', '.')) ?? 1,
+                    category: category,
+                    assignment: category == Categories.alcohol
+                        ? Assignment(mode: AssignMode.drinkers)
+                        : Assignment(),
+                  );
+                  receipt.items.add(it);
+                } else {
+                  item
+                    ..name = name.text.trim()
+                    ..totalGr = gr
+                    ..qty = double.tryParse(qty.text.replaceAll(',', '.')) ?? 1
+                    ..category = category;
+                }
+              });
+              Navigator.pop(c);
+            },
+            child: const Text('Save'),
+          ),
+        ],
+      ),
+    ),
+  );
+}
+
+String _zl(int gr) => (gr / 100).toStringAsFixed(2);
+
+int? _parseZl(String s) {
+  final v = double.tryParse(s.replaceAll(',', '.').replaceAll(' ', ''));
+  if (v == null) return null;
+  return (v * 100).round();
+}

billsplit/lib/ui/people_screen.dart

@@ -0,0 +1,273 @@
+import 'package:billsplit/domain/models.dart';
+import 'package:billsplit/state/app_state.dart';
+import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+
+/// Roster management: people with a drinks toggle, plus custom groups.
+class PeopleScreen extends StatelessWidget {
+  /// Creates the people screen.
+  const PeopleScreen({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    final state = context.watch<AppState>();
+    return Scaffold(
+      appBar: AppBar(title: const Text('People & groups')),
+      body: ListView(
+        padding: const EdgeInsets.only(bottom: 96),
+        children: [
+          const _SectionHeader('People'),
+          if (state.people.isEmpty)
+            const Padding(
+              padding: EdgeInsets.all(16),
+              child: Text('Nobody yet — add people below.'),
+            ),
+          for (final p in state.people) _PersonTile(person: p),
+          const Divider(height: 32),
+          const _SectionHeader('Groups'),
+          const Padding(
+            padding: EdgeInsets.symmetric(horizontal: 16),
+            child: Text(
+              'Drinkers / non-drinkers are built in (the toggle on each '
+              'person). Groups below are extra tags, e.g. "meat eaters".',
+              style: TextStyle(fontSize: 12, color: Colors.black54),
+            ),
+          ),
+          for (final g in state.groups) _GroupTile(group: g),
+          Padding(
+            padding: const EdgeInsets.all(16),
+            child: OutlinedButton.icon(
+              icon: const Icon(Icons.add),
+              label: const Text('Add group'),
+              onPressed: () => _addGroup(context),
+            ),
+          ),
+        ],
+      ),
+      floatingActionButton: FloatingActionButton.extended(
+        icon: const Icon(Icons.person_add),
+        label: const Text('Add person'),
+        onPressed: () => _addPerson(context),
+      ),
+    );
+  }
+
+  Future<void> _addPerson(BuildContext context) async {
+    final state = context.read<AppState>();
+    final controller = TextEditingController();
+    var drinks = true;
+    await showDialog<void>(
+      context: context,
+      builder: (c) => StatefulBuilder(
+        builder: (c, setState) => AlertDialog(
+          title: const Text('Add person'),
+          content: Column(
+            mainAxisSize: MainAxisSize.min,
+            children: [
+              TextField(
+                controller: controller,
+                autofocus: true,
+                decoration: const InputDecoration(labelText: 'Name'),
+              ),
+              SwitchListTile(
+                title: const Text('Drinks alcohol'),
+                value: drinks,
+                onChanged: (v) => setState(() => drinks = v),
+              ),
+            ],
+          ),
+          actions: [
+            TextButton(
+              onPressed: () => Navigator.pop(c),
+              child: const Text('Cancel'),
+            ),
+            FilledButton(
+              onPressed: () {
+                if (controller.text.trim().isNotEmpty) {
+                  state.addPerson(controller.text.trim(), drinks: drinks);
+                }
+                Navigator.pop(c);
+              },
+              child: const Text('Add'),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+
+  Future<void> _addGroup(BuildContext context) async {
+    final state = context.read<AppState>();
+    final controller = TextEditingController();
+    await showDialog<void>(
+      context: context,
+      builder: (c) => AlertDialog(
+        title: const Text('Add group'),
+        content: TextField(
+          controller: controller,
+          autofocus: true,
+          decoration: const InputDecoration(labelText: 'Group name'),
+        ),
+        actions: [
+          TextButton(
+            onPressed: () => Navigator.pop(c),
+            child: const Text('Cancel'),
+          ),
+          FilledButton(
+            onPressed: () {
+              if (controller.text.trim().isNotEmpty) {
+                state.addGroup(controller.text.trim());
+              }
+              Navigator.pop(c);
+            },
+            child: const Text('Add'),
+          ),
+        ],
+      ),
+    );
+  }
+}
+
+class _SectionHeader extends StatelessWidget {
+  const _SectionHeader(this.text);
+  final String text;
+
+  @override
+  Widget build(BuildContext context) => Padding(
+        padding: const EdgeInsets.fromLTRB(16, 16, 16, 4),
+        child: Text(text, style: Theme.of(context).textTheme.titleMedium),
+      );
+}
+
+class _PersonTile extends StatelessWidget {
+  const _PersonTile({required this.person});
+  final Person person;
+
+  @override
+  Widget build(BuildContext context) {
+    final state = context.read<AppState>();
+    return ListTile(
+      leading: CircleAvatar(
+        child: Text(
+          person.name.isEmpty ? '?' : person.name.substring(0, 1).toUpperCase(),
+        ),
+      ),
+      title: Text(person.name),
+      subtitle: Wrap(
+        spacing: 6,
+        children: [
+          for (final g in state.groups.where(
+            (g) => g.memberIds.contains(person.id),
+          ))
+            Chip(
+              label: Text(g.name, style: const TextStyle(fontSize: 11)),
+              visualDensity: VisualDensity.compact,
+              materialTapTargetSize: MaterialTapTargetSize.shrinkWrap,
+            ),
+        ],
+      ),
+      trailing: Row(
+        mainAxisSize: MainAxisSize.min,
+        children: [
+          Tooltip(
+            message: 'Drinks alcohol',
+            child: Switch(
+              value: person.drinks,
+              onChanged: (v) => state.mutate(() => person.drinks = v),
+            ),
+          ),
+          IconButton(
+            icon: const Icon(Icons.delete_outline),
+            onPressed: () => _confirmRemove(context, state),
+          ),
+        ],
+      ),
+      onTap: () => _editMembership(context, state),
+    );
+  }
+
+  Future<void> _confirmRemove(BuildContext context, AppState state) async {
+    final ok = await showDialog<bool>(
+      context: context,
+      builder: (c) => AlertDialog(
+        title: Text('Remove ${person.name}?'),
+        content: const Text(
+          'They will be removed from all receipts and item assignments.',
+        ),
+        actions: [
+          TextButton(
+            onPressed: () => Navigator.pop(c, false),
+            child: const Text('Cancel'),
+          ),
+          FilledButton(
+            onPressed: () => Navigator.pop(c, true),
+            child: const Text('Remove'),
+          ),
+        ],
+      ),
+    );
+    if (ok == true) state.removePerson(person);
+  }
+
+  Future<void> _editMembership(BuildContext context, AppState state) async {
+    if (state.groups.isEmpty) return;
+    await showModalBottomSheet<void>(
+      context: context,
+      builder: (c) => StatefulBuilder(
+        builder: (c, setState) => SafeArea(
+          child: ListView(
+            shrinkWrap: true,
+            children: [
+              Padding(
+                padding: const EdgeInsets.all(16),
+                child: Text(
+                  '${person.name} — groups',
+                  style: Theme.of(c).textTheme.titleMedium,
+                ),
+              ),
+              for (final g in state.groups)
+                CheckboxListTile(
+                  title: Text(g.name),
+                  value: g.memberIds.contains(person.id),
+                  onChanged: (v) {
+                    state.mutate(() {
+                      if (v == true) {
+                        g.memberIds.add(person.id);
+                      } else {
+                        g.memberIds.remove(person.id);
+                      }
+                    });
+                    setState(() {});
+                  },
+                ),
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+}
+
+class _GroupTile extends StatelessWidget {
+  const _GroupTile({required this.group});
+  final Group group;
+
+  @override
+  Widget build(BuildContext context) {
+    final state = context.read<AppState>();
+    final names = state.people
+        .where((p) => group.memberIds.contains(p.id))
+        .map((p) => p.name)
+        .join(', ');
+    return ListTile(
+      leading: const Icon(Icons.label_outline),
+      title: Text(group.name),
+      subtitle:
+          Text(names.isEmpty ? 'No members — tap a person to add' : names),
+      trailing: IconButton(
+        icon: const Icon(Icons.delete_outline),
+        onPressed: () => state.removeGroup(group),
+      ),
+    );
+  }
+}

billsplit/lib/ui/receipt_screen.dart

@@ -0,0 +1,357 @@
+import 'package:billsplit/domain/models.dart';
+import 'package:billsplit/domain/split_engine.dart';
+import 'package:billsplit/domain/xlsx_export.dart';
+import 'package:billsplit/state/app_state.dart';
+import 'package:billsplit/ui/assignment_sheet.dart';
+import 'package:billsplit/ui/item_edit.dart';
+import 'package:file_picker/file_picker.dart';
+import 'package:flutter/foundation.dart';
+import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+
+/// One receipt: item list with assignments, totals, participants, export.
+class ReceiptScreen extends StatefulWidget {
+  /// Creates the screen for the receipt with [receiptId].
+  const ReceiptScreen({required this.receiptId, super.key});
+
+  /// Id of the receipt to show; resolved against [AppState.receipts].
+  final String receiptId;
+
+  @override
+  State<ReceiptScreen> createState() => _ReceiptScreenState();
+}
+
+class _ReceiptScreenState extends State<ReceiptScreen> {
+  @override
+  Widget build(BuildContext context) {
+    final state = context.watch<AppState>();
+    final receipt =
+        state.receipts.where((r) => r.id == widget.receiptId).firstOrNull;
+    if (receipt == null) {
+      return const Scaffold(body: Center(child: Text('Receipt deleted.')));
+    }
+    final split = computeSplit(receipt, state.people, state.groups);
+    final wide = MediaQuery.of(context).size.width > 800;
+
+    final itemsList = _ItemsList(receipt: receipt, split: split);
+    final totals = _TotalsView(receipt: receipt, split: split);
+
+    return DefaultTabController(
+      length: 2,
+      child: Scaffold(
+        appBar: AppBar(
+          title: Text(receipt.title, overflow: TextOverflow.ellipsis),
+          actions: [
+            IconButton(
+              tooltip: 'Participants',
+              icon: const Icon(Icons.group),
+              onPressed: () => _editParticipants(context, state, receipt),
+            ),
+            IconButton(
+              tooltip: 'Export .xlsx',
+              icon: const Icon(Icons.table_view),
+              onPressed: () => _export(context, state, receipt),
+            ),
+          ],
+          bottom: wide
+              ? null
+              : const TabBar(
+                  tabs: [
+                    Tab(text: 'Items'),
+                    Tab(text: 'Totals'),
+                  ],
+                ),
+        ),
+        floatingActionButton: FloatingActionButton(
+          tooltip: 'Add item',
+          child: const Icon(Icons.add),
+          onPressed: () => showItemEditDialog(context, state, receipt, null),
+        ),
+        body: wide
+            ? Row(
+                children: [
+                  Expanded(flex: 3, child: itemsList),
+                  const VerticalDivider(width: 1),
+                  Expanded(flex: 2, child: totals),
+                ],
+              )
+            : TabBarView(children: [itemsList, totals]),
+      ),
+    );
+  }
+
+  Future<void> _editParticipants(
+    BuildContext context,
+    AppState state,
+    Receipt receipt,
+  ) async {
+    if (state.people.isEmpty) {
+      ScaffoldMessenger.of(context).showSnackBar(
+        const SnackBar(
+          content: Text('Add people first (People & groups screen).'),
+        ),
+      );
+      return;
+    }
+    await showModalBottomSheet<void>(
+      context: context,
+      builder: (c) => StatefulBuilder(
+        builder: (c, setSheet) => SafeArea(
+          child: ListView(
+            shrinkWrap: true,
+            children: [
+              Padding(
+                padding: const EdgeInsets.all(16),
+                child: Text(
+                  'Who is on this receipt?',
+                  style: Theme.of(c).textTheme.titleMedium,
+                ),
+              ),
+              for (final p in state.people)
+                CheckboxListTile(
+                  title: Text(p.name),
+                  subtitle: p.drinks ? null : const Text('non-drinker'),
+                  value: receipt.participantIds.contains(p.id),
+                  onChanged: (v) {
+                    state.mutate(() {
+                      if (v == true) {
+                        receipt.participantIds.add(p.id);
+                      } else {
+                        receipt.participantIds.remove(p.id);
+                      }
+                    });
+                    setSheet(() {});
+                  },
+                ),
+            ],
+          ),
+        ),
+      ),
+    );
+  }
+
+  Future<void> _export(
+    BuildContext context,
+    AppState state,
+    Receipt receipt,
+  ) async {
+    final messenger = ScaffoldMessenger.of(context);
+    if (receipt.participantIds.isEmpty) {
+      messenger.showSnackBar(
+        const SnackBar(content: Text('Add participants before exporting.')),
+      );
+      return;
+    }
+    try {
+      final bytes = Uint8List.fromList(
+        exportXlsx(
+          receipt: receipt,
+          roster: state.people,
+          groups: state.groups,
+        ),
+      );
+      final safe = receipt.title.replaceAll(
+        RegExp(r'[^\w\d ąćęłńóśżźĄĆĘŁŃÓŚŻŹ-]'),
+        '_',
+      );
+      final path = await FilePicker.saveFile(
+        dialogTitle: 'Save split as .xlsx',
+        fileName: '$safe split.xlsx',
+        type: FileType.custom,
+        allowedExtensions: ['xlsx'],
+        bytes: bytes,
+      );
+      if (path != null) {
+        messenger.showSnackBar(
+          SnackBar(content: Text('Saved: ${path.split('/').last}')),
+        );
+      }
+    } on Exception catch (e) {
+      messenger.showSnackBar(SnackBar(content: Text('Export failed: $e')));
+    }
+  }
+}
+
+class _ItemsList extends StatelessWidget {
+  const _ItemsList({required this.receipt, required this.split});
+  final Receipt receipt;
+  final SplitResult split;
+
+  @override
+  Widget build(BuildContext context) {
+    final state = context.read<AppState>();
+    if (receipt.items.isEmpty) {
+      return const Center(child: Text('No items — add with +.'));
+    }
+    return ListView.builder(
+      padding: const EdgeInsets.only(bottom: 96),
+      itemCount: receipt.items.length,
+      itemBuilder: (context, i) {
+        final item = receipt.items[i];
+        final people =
+            resolveParticipants(item, receipt, state.people, state.groups);
+        final unassigned = people.isEmpty;
+        return ListTile(
+          dense: true,
+          leading: _CategoryDot(category: item.category),
+          title: Text(item.name),
+          subtitle: Text(
+            _assignmentLabel(item, people.length, state),
+            style: TextStyle(
+              color: unassigned ? Colors.red : null,
+              fontWeight: unassigned ? FontWeight.bold : null,
+            ),
+          ),
+          trailing: Text(formatPln(item.totalGr)),
+          onTap: () => showAssignmentSheet(context, state, receipt, item),
+          onLongPress: () => showItemEditDialog(context, state, receipt, item),
+        );
+      },
+    );
+  }
+
+  String _assignmentLabel(Item item, int n, AppState state) {
+    switch (item.assignment.mode) {
+      case AssignMode.everyone:
+        return 'Everyone ($n)';
+      case AssignMode.drinkers:
+        return 'Drinkers only ($n)';
+      case AssignMode.nonDrinkers:
+        return 'Non-drinkers ($n)';
+      case AssignMode.group:
+        final g = state.groups
+            .where((g) => g.id == item.assignment.groupId)
+            .firstOrNull;
+        return 'Group: ${g?.name ?? '?'} ($n)';
+      case AssignMode.custom:
+        return n == 0 ? 'UNASSIGNED — tap to fix' : 'Selected people ($n)';
+    }
+  }
+}
+
+class _CategoryDot extends StatelessWidget {
+  const _CategoryDot({required this.category});
+  final String category;
+
+  @override
+  Widget build(BuildContext context) {
+    final color = switch (category) {
+      Categories.alcohol => Colors.deepOrange,
+      Categories.mixer => Colors.amber,
+      Categories.deposit => Colors.blueGrey,
+      _ => Colors.teal,
+    };
+    return CircleAvatar(radius: 6, backgroundColor: color);
+  }
+}
+
+class _TotalsView extends StatelessWidget {
+  const _TotalsView({required this.receipt, required this.split});
+  final Receipt receipt;
+  final SplitResult split;
+
+  @override
+  Widget build(BuildContext context) {
+    final state = context.read<AppState>();
+    final people = receiptParticipants(receipt, state.people)
+      ..sort((a, b) => a.name.toLowerCase().compareTo(b.name.toLowerCase()));
+    final itemsTotal = receipt.itemsTotalGr;
+    final assigned = split.assignedTotalGr;
+    final paid = receipt.paidTotalGr;
+
+    return ListView(
+      padding: const EdgeInsets.all(16),
+      children: [
+        if (split.unassigned.isNotEmpty)
+          Card(
+            color: Colors.red.shade50,
+            child: Padding(
+              padding: const EdgeInsets.all(12),
+              child: Text(
+                '${split.unassigned.length} item(s) have nobody assigned and '
+                'are excluded from totals:\n'
+                '${split.unassigned.map((i) => '· ${i.name}').join('\n')}',
+                style: const TextStyle(color: Colors.red),
+              ),
+            ),
+          ),
+        for (final p in people)
+          _PersonRow(person: p, total: split.perPerson[p.id]),
+        const Divider(height: 32),
+        _kv(context, 'Items total', formatPln(itemsTotal), bold: true),
+        _kv(
+          context,
+          'Assigned to people',
+          formatPln(assigned),
+          warn: assigned != itemsTotal,
+        ),
+        if (paid != null)
+          _kv(
+            context,
+            'Paid (receipt)',
+            formatPln(paid),
+            warn: paid != itemsTotal,
+          ),
+        const SizedBox(height: 8),
+        Text(
+          'Splits are grosz-exact: shares always add up to the item total, '
+          'so no fractional grosze are lost.',
+          style: Theme.of(context).textTheme.bodySmall,
+        ),
+      ],
+    );
+  }
+
+  Widget _kv(
+    BuildContext context,
+    String k,
+    String v, {
+    bool bold = false,
+    bool warn = false,
+  }) {
+    final style = TextStyle(
+      fontWeight: bold || warn ? FontWeight.bold : null,
+      color: warn ? Colors.red : null,
+    );
+    return Padding(
+      padding: const EdgeInsets.symmetric(vertical: 2),
+      child: Row(
+        mainAxisAlignment: MainAxisAlignment.spaceBetween,
+        children: [Text(k, style: style), Text(v, style: style)],
+      ),
+    );
+  }
+}
+
+class _PersonRow extends StatelessWidget {
+  const _PersonRow({required this.person, required this.total});
+  final Person person;
+  final PersonTotal? total;
+
+  @override
+  Widget build(BuildContext context) {
+    final t = total;
+    return ListTile(
+      contentPadding: EdgeInsets.zero,
+      leading: CircleAvatar(
+        child: Text(
+          person.name.isEmpty ? '?' : person.name.substring(0, 1).toUpperCase(),
+        ),
+      ),
+      title: Text(person.name),
+      subtitle: t == null || t.alcoholGr == 0
+          ? null
+          : Text(
+              'alcohol ${formatPln(t.alcoholGr)} · rest ${formatPln(t.restGr)}',
+            ),
+      trailing: Text(
+        formatPln(t?.totalGr ?? 0),
+        style: Theme.of(context).textTheme.titleMedium,
+      ),
+    );
+  }
+}
+
+extension<T> on Iterable<T> {
+  T? get firstOrNull => isEmpty ? null : first;
+}

billsplit/linux/.gitignore

@@ -0,0 +1 @@
+flutter/ephemeral

billsplit/linux/CMakeLists.txt

@@ -0,0 +1,128 @@
+# Project-level configuration.
+cmake_minimum_required(VERSION 3.13)
+project(runner LANGUAGES CXX)
+
+# The name of the executable created for the application. Change this to change
+# the on-disk name of your application.
+set(BINARY_NAME "billsplit")
+# The unique GTK application identifier for this application. See:
+# https://wiki.gnome.org/HowDoI/ChooseApplicationID
+set(APPLICATION_ID "dev.kuhy.billsplit")
+
+# Explicitly opt in to modern CMake behaviors to avoid warnings with recent
+# versions of CMake.
+cmake_policy(SET CMP0063 NEW)
+
+# Load bundled libraries from the lib/ directory relative to the binary.
+set(CMAKE_INSTALL_RPATH "$ORIGIN/lib")
+
+# Root filesystem for cross-building.
+if(FLUTTER_TARGET_PLATFORM_SYSROOT)
+  set(CMAKE_SYSROOT ${FLUTTER_TARGET_PLATFORM_SYSROOT})
+  set(CMAKE_FIND_ROOT_PATH ${CMAKE_SYSROOT})
+  set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
+  set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)
+  set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+  set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
+endif()
+
+# Define build configuration options.
+if(NOT CMAKE_BUILD_TYPE AND NOT CMAKE_CONFIGURATION_TYPES)
+  set(CMAKE_BUILD_TYPE "Debug" CACHE
+    STRING "Flutter build mode" FORCE)
+  set_property(CACHE CMAKE_BUILD_TYPE PROPERTY STRINGS
+    "Debug" "Profile" "Release")
+endif()
+
+# Compilation settings that should be applied to most targets.
+#
+# Be cautious about adding new options here, as plugins use this function by
+# default. In most cases, you should add new options to specific targets instead
+# of modifying this function.
+function(APPLY_STANDARD_SETTINGS TARGET)
+  target_compile_features(${TARGET} PUBLIC cxx_std_14)
+  target_compile_options(${TARGET} PRIVATE -Wall -Werror)
+  target_compile_options(${TARGET} PRIVATE "$<$<NOT:$<CONFIG:Debug>>:-O3>")
+  target_compile_definitions(${TARGET} PRIVATE "$<$<NOT:$<CONFIG:Debug>>:NDEBUG>")
+endfunction()
+
+# Flutter library and tool build rules.
+set(FLUTTER_MANAGED_DIR "${CMAKE_CURRENT_SOURCE_DIR}/flutter")
+add_subdirectory(${FLUTTER_MANAGED_DIR})
+
+# System-level dependencies.
+find_package(PkgConfig REQUIRED)
+pkg_check_modules(GTK REQUIRED IMPORTED_TARGET gtk+-3.0)
+
+# Application build; see runner/CMakeLists.txt.
+add_subdirectory("runner")
+
+# Run the Flutter tool portions of the build. This must not be removed.
+add_dependencies(${BINARY_NAME} flutter_assemble)
+
+# Only the install-generated bundle's copy of the executable will launch
+# correctly, since the resources must in the right relative locations. To avoid
+# people trying to run the unbundled copy, put it in a subdirectory instead of
+# the default top-level location.
+set_target_properties(${BINARY_NAME}
+  PROPERTIES
+  RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/intermediates_do_not_run"
+)
+
+
+# Generated plugin build rules, which manage building the plugins and adding
+# them to the application.
+include(flutter/generated_plugins.cmake)
+
+
+# === Installation ===
+# By default, "installing" just makes a relocatable bundle in the build
+# directory.
+set(BUILD_BUNDLE_DIR "${PROJECT_BINARY_DIR}/bundle")
+if(CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT)
+  set(CMAKE_INSTALL_PREFIX "${BUILD_BUNDLE_DIR}" CACHE PATH "..." FORCE)
+endif()
+
+# Start with a clean build bundle directory every time.
+install(CODE "
+  file(REMOVE_RECURSE \"${BUILD_BUNDLE_DIR}/\")
+  " COMPONENT Runtime)
+
+set(INSTALL_BUNDLE_DATA_DIR "${CMAKE_INSTALL_PREFIX}/data")
+set(INSTALL_BUNDLE_LIB_DIR "${CMAKE_INSTALL_PREFIX}/lib")
+
+install(TARGETS ${BINARY_NAME} RUNTIME DESTINATION "${CMAKE_INSTALL_PREFIX}"
+  COMPONENT Runtime)
+
+install(FILES "${FLUTTER_ICU_DATA_FILE}" DESTINATION "${INSTALL_BUNDLE_DATA_DIR}"
+  COMPONENT Runtime)
+
+install(FILES "${FLUTTER_LIBRARY}" DESTINATION "${INSTALL_BUNDLE_LIB_DIR}"
+  COMPONENT Runtime)
+
+foreach(bundled_library ${PLUGIN_BUNDLED_LIBRARIES})
+  install(FILES "${bundled_library}"
+    DESTINATION "${INSTALL_BUNDLE_LIB_DIR}"
+    COMPONENT Runtime)
+endforeach(bundled_library)
+
+# Copy the native assets provided by the build.dart from all packages.
+set(NATIVE_ASSETS_DIR "${PROJECT_BUILD_DIR}native_assets/linux/")
+install(DIRECTORY "${NATIVE_ASSETS_DIR}"
+   DESTINATION "${INSTALL_BUNDLE_LIB_DIR}"
+   COMPONENT Runtime)
+
+# Fully re-copy the assets directory on each build to avoid having stale files
+# from a previous install.
+set(FLUTTER_ASSET_DIR_NAME "flutter_assets")
+install(CODE "
+  file(REMOVE_RECURSE \"${INSTALL_BUNDLE_DATA_DIR}/${FLUTTER_ASSET_DIR_NAME}\")
+  " COMPONENT Runtime)
+install(DIRECTORY "${PROJECT_BUILD_DIR}/${FLUTTER_ASSET_DIR_NAME}"
+  DESTINATION "${INSTALL_BUNDLE_DATA_DIR}" COMPONENT Runtime)
+
+# Install the AOT library on non-Debug builds only.
+if(NOT CMAKE_BUILD_TYPE MATCHES "Debug")
+  install(FILES "${AOT_LIBRARY}" DESTINATION "${INSTALL_BUNDLE_LIB_DIR}"
+    COMPONENT Runtime)
+endif()

billsplit/linux/flutter/CMakeLists.txt

@@ -0,0 +1,88 @@
+# This file controls Flutter-level build steps. It should not be edited.
+cmake_minimum_required(VERSION 3.10)
+
+set(EPHEMERAL_DIR "${CMAKE_CURRENT_SOURCE_DIR}/ephemeral")
+
+# Configuration provided via flutter tool.
+include(${EPHEMERAL_DIR}/generated_config.cmake)
+
+# TODO: Move the rest of this into files in ephemeral. See
+# https://github.com/flutter/flutter/issues/57146.
+
+# Serves the same purpose as list(TRANSFORM ... PREPEND ...),
+# which isn't available in 3.10.
+function(list_prepend LIST_NAME PREFIX)
+    set(NEW_LIST "")
+    foreach(element ${${LIST_NAME}})
+        list(APPEND NEW_LIST "${PREFIX}${element}")
+    endforeach(element)
+    set(${LIST_NAME} "${NEW_LIST}" PARENT_SCOPE)
+endfunction()
+
+# === Flutter Library ===
+# System-level dependencies.
+find_package(PkgConfig REQUIRED)
+pkg_check_modules(GTK REQUIRED IMPORTED_TARGET gtk+-3.0)
+pkg_check_modules(GLIB REQUIRED IMPORTED_TARGET glib-2.0)
+pkg_check_modules(GIO REQUIRED IMPORTED_TARGET gio-2.0)
+
+set(FLUTTER_LIBRARY "${EPHEMERAL_DIR}/libflutter_linux_gtk.so")
+
+# Published to parent scope for install step.
+set(FLUTTER_LIBRARY ${FLUTTER_LIBRARY} PARENT_SCOPE)
+set(FLUTTER_ICU_DATA_FILE "${EPHEMERAL_DIR}/icudtl.dat" PARENT_SCOPE)
+set(PROJECT_BUILD_DIR "${PROJECT_DIR}/build/" PARENT_SCOPE)
+set(AOT_LIBRARY "${PROJECT_DIR}/build/lib/libapp.so" PARENT_SCOPE)
+
+list(APPEND FLUTTER_LIBRARY_HEADERS
+  "fl_basic_message_channel.h"
+  "fl_binary_codec.h"
+  "fl_binary_messenger.h"
+  "fl_dart_project.h"
+  "fl_engine.h"
+  "fl_json_message_codec.h"
+  "fl_json_method_codec.h"
+  "fl_message_codec.h"
+  "fl_method_call.h"
+  "fl_method_channel.h"
+  "fl_method_codec.h"
+  "fl_method_response.h"
+  "fl_plugin_registrar.h"
+  "fl_plugin_registry.h"
+  "fl_standard_message_codec.h"
+  "fl_standard_method_codec.h"
+  "fl_string_codec.h"
+  "fl_value.h"
+  "fl_view.h"
+  "flutter_linux.h"
+)
+list_prepend(FLUTTER_LIBRARY_HEADERS "${EPHEMERAL_DIR}/flutter_linux/")
+add_library(flutter INTERFACE)
+target_include_directories(flutter INTERFACE
+  "${EPHEMERAL_DIR}"
+)
+target_link_libraries(flutter INTERFACE "${FLUTTER_LIBRARY}")
+target_link_libraries(flutter INTERFACE
+  PkgConfig::GTK
+  PkgConfig::GLIB
+  PkgConfig::GIO
+)
+add_dependencies(flutter flutter_assemble)
+
+# === Flutter tool backend ===
+# _phony_ is a non-existent file to force this command to run every time,
+# since currently there's no way to get a full input/output list from the
+# flutter tool.
+add_custom_command(
+  OUTPUT ${FLUTTER_LIBRARY} ${FLUTTER_LIBRARY_HEADERS}
+    ${CMAKE_CURRENT_BINARY_DIR}/_phony_
+  COMMAND ${CMAKE_COMMAND} -E env
+    ${FLUTTER_TOOL_ENVIRONMENT}
+    "${FLUTTER_ROOT}/packages/flutter_tools/bin/tool_backend.sh"
+      ${FLUTTER_TARGET_PLATFORM} ${CMAKE_BUILD_TYPE}
+  VERBATIM
+)
+add_custom_target(flutter_assemble DEPENDS
+  "${FLUTTER_LIBRARY}"
+  ${FLUTTER_LIBRARY_HEADERS}
+)

billsplit/linux/flutter/generated_plugin_registrant.cc

@@ -0,0 +1,11 @@
+//
+//  Generated file. Do not edit.
+//
+
+// clang-format off
+
+#include "generated_plugin_registrant.h"
+
+
+void fl_register_plugins(FlPluginRegistry* registry) {
+}

billsplit/linux/flutter/generated_plugin_registrant.h

@@ -0,0 +1,15 @@
+//
+//  Generated file. Do not edit.
+//
+
+// clang-format off
+
+#ifndef GENERATED_PLUGIN_REGISTRANT_
+#define GENERATED_PLUGIN_REGISTRANT_
+
+#include <flutter_linux/flutter_linux.h>
+
+// Registers Flutter plugins.
+void fl_register_plugins(FlPluginRegistry* registry);
+
+#endif  // GENERATED_PLUGIN_REGISTRANT_

billsplit/linux/flutter/generated_plugins.cmake

@@ -0,0 +1,24 @@
+#
+# Generated file, do not edit.
+#
+
+list(APPEND FLUTTER_PLUGIN_LIST
+)
+
+list(APPEND FLUTTER_FFI_PLUGIN_LIST
+  jni
+)
+
+set(PLUGIN_BUNDLED_LIBRARIES)
+
+foreach(plugin ${FLUTTER_PLUGIN_LIST})
+  add_subdirectory(flutter/ephemeral/.plugin_symlinks/${plugin}/linux plugins/${plugin})
+  target_link_libraries(${BINARY_NAME} PRIVATE ${plugin}_plugin)
+  list(APPEND PLUGIN_BUNDLED_LIBRARIES $<TARGET_FILE:${plugin}_plugin>)
+  list(APPEND PLUGIN_BUNDLED_LIBRARIES ${${plugin}_bundled_libraries})
+endforeach(plugin)
+
+foreach(ffi_plugin ${FLUTTER_FFI_PLUGIN_LIST})
+  add_subdirectory(flutter/ephemeral/.plugin_symlinks/${ffi_plugin}/linux plugins/${ffi_plugin})
+  list(APPEND PLUGIN_BUNDLED_LIBRARIES ${${ffi_plugin}_bundled_libraries})
+endforeach(ffi_plugin)

billsplit/linux/runner/CMakeLists.txt

@@ -0,0 +1,26 @@
+cmake_minimum_required(VERSION 3.13)
+project(runner LANGUAGES CXX)
+
+# Define the application target. To change its name, change BINARY_NAME in the
+# top-level CMakeLists.txt, not the value here, or `flutter run` will no longer
+# work.
+#
+# Any new source files that you add to the application should be added here.
+add_executable(${BINARY_NAME}
+  "main.cc"
+  "my_application.cc"
+  "${FLUTTER_MANAGED_DIR}/generated_plugin_registrant.cc"
+)
+
+# Apply the standard set of build settings. This can be removed for applications
+# that need different build settings.
+apply_standard_settings(${BINARY_NAME})
+
+# Add preprocessor definitions for the application ID.
+add_definitions(-DAPPLICATION_ID="${APPLICATION_ID}")
+
+# Add dependency libraries. Add any application-specific dependencies here.
+target_link_libraries(${BINARY_NAME} PRIVATE flutter)
+target_link_libraries(${BINARY_NAME} PRIVATE PkgConfig::GTK)
+
+target_include_directories(${BINARY_NAME} PRIVATE "${CMAKE_SOURCE_DIR}")

billsplit/linux/runner/main.cc

@@ -0,0 +1,6 @@
+#include "my_application.h"
+
+int main(int argc, char** argv) {
+  g_autoptr(MyApplication) app = my_application_new();
+  return g_application_run(G_APPLICATION(app), argc, argv);
+}