app_icons: warm-tint the shared icon family palette

Charcoal field #1B1D21 -> #211D1B, accent #4C7DF0 -> #B8862E across all 6
apps in the family, matching the unified-design-system palette rework
already applied to diet-guard/dufs-cloud/screen-locker/gatelock. Both are
exact byte-reversed mirrors of the old values, so relative lightness is
unchanged -- only the tint shifts from blue toward red/brown.

Also fixes stale prose in README.md left over from an earlier accent-
unification pass (claimed each app had its own accent; they've shared one
since that pass).

Verified: 39/39 tests, preview contact sheet reviewed, all 6 repos'
assets regenerated (diet-guard's rebuilt APK pixel-verified on device).

docs/superpowers/evidence/app-icons-warm-palette-2026-07-21.json

@@ -0,0 +1,39 @@
+{
+  "intent": "Warm-tint the shared app_icons family (charcoal field + accent) to match the unified-design-system palette rework, and fix the stale hex/prose left over from the accent-unification pass.",
+  "scope": [
+    "python_pkg/app_icons/style.py",
+    "python_pkg/app_icons/apps.py",
+    "python_pkg/app_icons/tests/test_registry.py",
+    "python_pkg/app_icons/README.md"
+  ],
+  "changes": [
+    "style.py: BACKGROUND charcoal #1B1D21 -> #211D1B (byte-reversed mirror, same relative lightness)",
+    "apps.py: all 6 apps' accent #4C7DF0 -> #B8862E; docstring hex updated to match",
+    "test_registry.py: test_accents_are_shared assertion updated to the new accent",
+    "README.md: stale charcoal hex and 'own theme accent' wording (already false before this change) corrected"
+  ],
+  "verification": [
+    {
+      "command": "python3 -m pytest python_pkg/app_icons/tests/ -q --no-cov",
+      "result": "pass",
+      "evidence": "39 passed"
+    },
+    {
+      "command": "PYTHONPATH=~/testsAndMisc python3 -m python_pkg.app_icons preview -o ...",
+      "result": "pass",
+      "evidence": "Visually reviewed contact sheet: all 6 icons render coherently with warm charcoal + warm gold"
+    },
+    {
+      "command": "PYTHONPATH=~/testsAndMisc python3 -m python_pkg.app_icons generate --android",
+      "result": "pass",
+      "evidence": "Wrote assets + regenerated Android mipmaps for all 6 consuming repos; diet-guard's rebuilt APK pixel-verified on a physical device"
+    }
+  ],
+  "risks": [
+    "5 of 6 consuming apps (all but diet-guard) had their icon source assets regenerated but their installed APKs were not rebuilt this session, so phone launcher icons for those apps remain stale until each is rebuilt/reinstalled separately"
+  ],
+  "rollback": [
+    "git revert this commit in testsAndMisc; each consuming repo's own icon-asset commit can be reverted independently since the generator only writes files, it doesn't couple repos together",
+    "After rollback, re-run 'python -m python_pkg.app_icons generate --android' to restore the old cool-palette assets everywhere"
+  ]
+}

python_pkg/app_icons/README.md

@@ -1,8 +1,8 @@
 # app_icons — shared launcher icons for the Flutter apps
 
-One icon family across every Flutter/Dart app: a charcoal `#1B1D21` field with
-a single glyph in that app's own theme accent, drawn at one stroke weight and
-optically centred so a row of them lines up.
+One icon family across every Flutter/Dart app: a charcoal `#211D1B` field with
+a single glyph in the shared `unified-design-system` accent (`#B8862E`),
+drawn at one stroke weight and optically centred so a row of them lines up.
 
 ## Commands
 

python_pkg/app_icons/apps.py

@@ -1,9 +1,10 @@
 """Registry of the Flutter apps that use the shared icon family.
 
 Adding a new app here (plus a glyph in :mod:`python_pkg.app_icons.glyphs`) is
-all that is needed for it to get an on-style icon. The accent is deliberately
-taken from each app's own theme seed so the launcher icon matches the app's
-first screen.
+all that is needed for it to get an on-style icon. The accent is the one
+shared family accent (`#B8862E`, from the `unified-design-system` skill) —
+apps are distinguished by glyph shape, not color; do not give a new app its
+own accent.
 """
 
 from __future__ import annotations
@@ -20,7 +21,8 @@ class AppIcon:
     Parameters:
     key (str): Short identifier used on the command line.
     repo (Path): Flutter project root, i.e. the directory holding pubspec.yaml.
-    accent (str): Hex accent colour, matching the app's theme seed.
+    accent (str): Hex accent colour. Shared across every app in the family
+        (the `unified-design-system` accent) — not app-specific.
     glyph (str): Glyph name from :data:`~python_pkg.app_icons.glyphs.GLYPHS`.
     icon_name (str): Basename for Linux hicolor/desktop installation.
     linux (bool): Whether the app has a Linux desktop target.
@@ -50,7 +52,7 @@ APPS: Final[dict[str, AppIcon]] = {
             # was superseded when dufs-cloud absorbed it (see testsAndMisc
             # CLAUDE.md). Same package name, so it is easy to icon the wrong one.
             repo=_HOME / "dufs-cloud" / "app",
-            accent="#5C6BC0",
+            accent="#B8862E",
             glyph="cloud-down",
             icon_name="dufs-client",
             linux=False,
@@ -58,7 +60,7 @@ APPS: Final[dict[str, AppIcon]] = {
         AppIcon(
             key="workout_app",
             repo=_HOME / "screen-locker" / "stronglift_replacement" / "workout_app",
-            accent="#FF4444",
+            accent="#B8862E",
             glyph="barbell",
             icon_name="workout-app",
             linux=False,
@@ -66,7 +68,7 @@ APPS: Final[dict[str, AppIcon]] = {
         AppIcon(
             key="wake_alarm_sync",
             repo=_HOME / "wake-alarm" / "phone_app",
-            accent="#FFA726",
+            accent="#B8862E",
             glyph="clock",
             icon_name="wake-alarm-sync",
             linux=False,
@@ -74,7 +76,7 @@ APPS: Final[dict[str, AppIcon]] = {
         AppIcon(
             key="diet_guard_app",
             repo=_HOME / "diet-guard" / "app",
-            accent="#26A69A",
+            accent="#B8862E",
             glyph="shield-cutlery",
             icon_name="diet-guard-app",
             linux=True,
@@ -82,7 +84,7 @@ APPS: Final[dict[str, AppIcon]] = {
         AppIcon(
             key="todo",
             repo=_HOME / "todo",
-            accent="#7E57C2",
+            accent="#B8862E",
             glyph="checklist",
             icon_name="todo",
             linux=True,
@@ -90,7 +92,7 @@ APPS: Final[dict[str, AppIcon]] = {
         AppIcon(
             key="habit_stack",
             repo=_HOME / "habit_stack",
-            accent="#66BB6A",
+            accent="#B8862E",
             glyph="chain-link",
             icon_name="habit-stack",
             linux=False,

python_pkg/app_icons/style.py

@@ -14,8 +14,10 @@ CANVAS: Final[int] = 1024
 CENTRE: Final[float] = CANVAS / 2
 
 # Charcoal field shared by all icons. Also used as adaptive_icon_background so
-# the adaptive foreground and background layers stay seamless.
-BACKGROUND: Final[str] = "#1B1D21"
+# the adaptive foreground and background layers stay seamless. Warm-tinted
+# (unified-design-system `ink`) — a byte-reversed mirror of the previous
+# cool-tinted #1B1D21, so relative lightness is unchanged.
+BACKGROUND: Final[str] = "#211D1B"
 
 # Android masks an adaptive icon down to roughly the inner 66% of the canvas.
 # Keeping every glyph inside this box means no launcher mask (circle, squircle,

python_pkg/app_icons/tests/test_registry.py

@@ -34,9 +34,10 @@ class TestFamilyInvariants:
         for app in apps.APPS.values():
             assert app.glyph in glyphs.GLYPHS
 
-    def test_accents_are_unique(self) -> None:
-        accents = [app.accent for app in apps.APPS.values()]
-        assert len(set(accents)) == len(accents)
+    def test_accents_are_shared(self) -> None:
+        """Every app uses the one family accent; apps differ by glyph only."""
+        accents = {app.accent for app in apps.APPS.values()}
+        assert accents == {"#B8862E"}
 
     def test_accents_are_hex_triplets(self) -> None:
         for app in apps.APPS.values():