diff --git a/web_ui/README.md b/web_ui/README.md
index aed7e66..03b31f3 100644
--- a/web_ui/README.md
+++ b/web_ui/README.md
@@ -13,7 +13,7 @@ this package is its executable form for the web.
 ```jsonc
 // package.json — pnpm only, see "Why the &path: suffix" below.
 "dependencies": {
-  "@kuhyx/web-ui": "github:kuhyx/utils#web_ui-v0.2.0&path:/web_ui"
+  "@kuhyx/web-ui": "github:kuhyx/utils#web_ui-v0.3.0&path:/web_ui"
 }
 ```
 
diff --git a/web_ui/dist/range-slider.d.ts b/web_ui/dist/range-slider.d.ts
index 2e633c6..0bf8b57 100644
--- a/web_ui/dist/range-slider.d.ts
+++ b/web_ui/dist/range-slider.d.ts
@@ -16,8 +16,16 @@ export interface RangeSliderProps {
     /** The full ascending distribution — not just its endpoints. */
     readonly values: readonly number[];
 }
-/** Steps one thumb by `delta` positions through the distribution. Pure, so the
- * keyboard contract is testable without layout. */
+/**
+ * Steps one thumb by `delta` positions through the distribution. Pure, so the
+ * keyboard contract is testable without layout.
+ *
+ * Steps to the next *distinct* value rather than the next index. Real
+ * distributions are lumpy -- awesome-mcp-explorer's star counts hold ~1500
+ * duplicate zeros -- and an index step inside a run of equal values changes the
+ * index while leaving the value (and therefore the thumb, and the filter)
+ * exactly where it was. That reads as a dead arrow key.
+ */
 export declare function steppedValue(values: readonly number[], current: number, delta: number): number;
 export declare function RangeSlider({ format, hi, label, lo, onChange, values, }: RangeSliderProps): null | React.JSX.Element;
 //# sourceMappingURL=range-slider.d.ts.map
\ No newline at end of file
diff --git a/web_ui/dist/range-slider.d.ts.map b/web_ui/dist/range-slider.d.ts.map
index ac62093..af3fcb5 100644
--- a/web_ui/dist/range-slider.d.ts.map
+++ b/web_ui/dist/range-slider.d.ts.map
@@ -1 +1 @@
-{"version":3,"file":"range-slider.d.ts","sourceRoot":"","sources":["../src/range-slider.tsx"],"names":[],"mappings":"AAyBA,MAAM,WAAW,gBAAgB;IAC/B;;;;OAIG;IACH,QAAQ,CAAC,MAAM,CAAC,EAAE,CAAC,KAAK,EAAE,MAAM,KAAK,MAAM,CAAC;IAC5C,6EAA6E;IAC7E,QAAQ,CAAC,EAAE,EAAE,MAAM,CAAC;IACpB,iEAAiE;IACjE,QAAQ,CAAC,KAAK,CAAC,EAAE,MAAM,CAAC;IACxB,6EAA6E;IAC7E,QAAQ,CAAC,EAAE,EAAE,MAAM,CAAC;IACpB,4EAA4E;IAC5E,QAAQ,CAAC,QAAQ,EAAE,CAAC,EAAE,EAAE,MAAM,EAAE,EAAE,EAAE,MAAM,KAAK,IAAI,CAAC;IACpD,gEAAgE;IAChE,QAAQ,CAAC,MAAM,EAAE,SAAS,MAAM,EAAE,CAAC;CACpC;AAID;mDACmD;AACnD,wBAAgB,YAAY,CAC1B,MAAM,EAAE,SAAS,MAAM,EAAE,EACzB,OAAO,EAAE,MAAM,EACf,KAAK,EAAE,MAAM,GACZ,MAAM,CAMR;AAED,wBAAgB,WAAW,CAAC,EAC1B,MAAM,EACN,EAAE,EACF,KAAK,EACL,EAAE,EACF,QAAQ,EACR,MAAM,GACP,EAAE,gBAAgB,GAAG,IAAI,GAAG,KAAK,CAAC,GAAG,CAAC,OAAO,CAyG7C"}
\ No newline at end of file
+{"version":3,"file":"range-slider.d.ts","sourceRoot":"","sources":["../src/range-slider.tsx"],"names":[],"mappings":"AAyBA,MAAM,WAAW,gBAAgB;IAC/B;;;;OAIG;IACH,QAAQ,CAAC,MAAM,CAAC,EAAE,CAAC,KAAK,EAAE,MAAM,KAAK,MAAM,CAAC;IAC5C,6EAA6E;IAC7E,QAAQ,CAAC,EAAE,EAAE,MAAM,CAAC;IACpB,iEAAiE;IACjE,QAAQ,CAAC,KAAK,CAAC,EAAE,MAAM,CAAC;IACxB,6EAA6E;IAC7E,QAAQ,CAAC,EAAE,EAAE,MAAM,CAAC;IACpB,4EAA4E;IAC5E,QAAQ,CAAC,QAAQ,EAAE,CAAC,EAAE,EAAE,MAAM,EAAE,EAAE,EAAE,MAAM,KAAK,IAAI,CAAC;IACpD,gEAAgE;IAChE,QAAQ,CAAC,MAAM,EAAE,SAAS,MAAM,EAAE,CAAC;CACpC;AAID;;;;;;;;;GASG;AACH,wBAAgB,YAAY,CAC1B,MAAM,EAAE,SAAS,MAAM,EAAE,EACzB,OAAO,EAAE,MAAM,EACf,KAAK,EAAE,MAAM,GACZ,MAAM,CAkBR;AAED,wBAAgB,WAAW,CAAC,EAC1B,MAAM,EACN,EAAE,EACF,KAAK,EACL,EAAE,EACF,QAAQ,EACR,MAAM,GACP,EAAE,gBAAgB,GAAG,IAAI,GAAG,KAAK,CAAC,GAAG,CAAC,OAAO,CAyG7C"}
\ No newline at end of file
diff --git a/web_ui/dist/range-slider.js b/web_ui/dist/range-slider.js
index 40a4240..9e238d7 100644
--- a/web_ui/dist/range-slider.js
+++ b/web_ui/dist/range-slider.js
@@ -22,14 +22,35 @@ import { jsx as _jsx, jsxs as _jsxs } from "react/jsx-runtime";
  */
 import { useCallback, useState } from "react";
 import { fractionFromPointer, nth, quantileValue, valueQuantile } from "./quantile.js";
-/** Steps one thumb by `delta` positions through the distribution. Pure, so the
- * keyboard contract is testable without layout. */
+/**
+ * Steps one thumb by `delta` positions through the distribution. Pure, so the
+ * keyboard contract is testable without layout.
+ *
+ * Steps to the next *distinct* value rather than the next index. Real
+ * distributions are lumpy -- awesome-mcp-explorer's star counts hold ~1500
+ * duplicate zeros -- and an index step inside a run of equal values changes the
+ * index while leaving the value (and therefore the thumb, and the filter)
+ * exactly where it was. That reads as a dead arrow key.
+ */
 export function steppedValue(values, current, delta) {
     const last = values.length - 1;
     // Round to a real sample index so a thumb sitting between two samples still
-    // advances by exactly one item rather than stalling on a fractional step.
+    // advances rather than stalling on a fractional step.
     const index = Math.round(valueQuantile(values, current) * last);
-    return nth(values, Math.min(last, Math.max(0, index + delta)));
+    const direction = Math.sign(delta);
+    if (direction === 0)
+        return nth(values, index);
+    let cursor = index;
+    for (let taken = 0; taken < Math.abs(delta); taken++) {
+        let next = cursor + direction;
+        while (next >= 0 && next <= last && nth(values, next) === nth(values, cursor)) {
+            next += direction;
+        }
+        if (next < 0 || next > last)
+            break;
+        cursor = next;
+    }
+    return nth(values, cursor);
 }
 export function RangeSlider({ format, hi, label, lo, onChange, values, }) {
     const [drag, setDrag] = useState(null);
diff --git a/web_ui/dist/range-slider.js.map b/web_ui/dist/range-slider.js.map
index d76b440..537c126 100644
--- a/web_ui/dist/range-slider.js.map
+++ b/web_ui/dist/range-slider.js.map
@@ -1 +1 @@
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\ No newline at end of file
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\ No newline at end of file
diff --git a/web_ui/package.json b/web_ui/package.json
index 1317a7c..f57e80b 100644
--- a/web_ui/package.json
+++ b/web_ui/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@kuhyx/web-ui",
-  "version": "0.2.0",
+  "version": "0.3.0",
   "private": false,
   "type": "module",
   "description": "The shared token + component layer for kuhy's web apps: the frozen palette, spacing/radius/type scales as CSS custom properties, and the components that were each reimplemented in two or more repos.",
diff --git a/web_ui/src/range-slider.test.tsx b/web_ui/src/range-slider.test.tsx
index 4cc75b5..57a770e 100644
--- a/web_ui/src/range-slider.test.tsx
+++ b/web_ui/src/range-slider.test.tsx
@@ -49,6 +49,41 @@ describe("steppedValue", () => {
   it("rounds a between-samples value to a real sample", () => {
     expect(steppedValue(VALUES, 34, 1)).toBe(40);
   });
+
+  it("returns the current sample for a zero delta", () => {
+    expect(steppedValue(VALUES, 30, 0)).toBe(30);
+  });
+
+  describe("on a lumpy distribution", () => {
+    // The shape that actually broke in the browser: awesome-mcp-explorer's
+    // star counts hold ~1500 duplicate zeros, so an index step inside the run
+    // moved the index but not the value, and the arrow key looked dead.
+    const LUMPY = [...Array.from({ length: 50 }, () => 0), 5, 5, 5, 100, 5000];
+
+    it("escapes a run of duplicates instead of stalling", () => {
+      expect(steppedValue(LUMPY, 0, 1)).toBe(5);
+    });
+
+    it("keeps stepping past the second run", () => {
+      expect(steppedValue(LUMPY, 5, 1)).toBe(100);
+    });
+
+    it("steps back out of a run", () => {
+      expect(steppedValue(LUMPY, 5, -1)).toBe(0);
+    });
+
+    it("counts distinct values for a multi-step jump", () => {
+      expect(steppedValue(LUMPY, 0, 2)).toBe(100);
+    });
+
+    it("clamps at the top rather than running off the end", () => {
+      expect(steppedValue(LUMPY, 5000, 1)).toBe(5000);
+    });
+
+    it("clamps at the bottom", () => {
+      expect(steppedValue(LUMPY, 0, -1)).toBe(0);
+    });
+  });
 });
 
 describe("RangeSlider", () => {
diff --git a/web_ui/src/range-slider.tsx b/web_ui/src/range-slider.tsx
index ce8604d..fc1b97d 100644
--- a/web_ui/src/range-slider.tsx
+++ b/web_ui/src/range-slider.tsx
@@ -44,8 +44,16 @@ export interface RangeSliderProps {
 
 type Thumb = "hi" | "lo";
 
-/** Steps one thumb by `delta` positions through the distribution. Pure, so the
- * keyboard contract is testable without layout. */
+/**
+ * Steps one thumb by `delta` positions through the distribution. Pure, so the
+ * keyboard contract is testable without layout.
+ *
+ * Steps to the next *distinct* value rather than the next index. Real
+ * distributions are lumpy -- awesome-mcp-explorer's star counts hold ~1500
+ * duplicate zeros -- and an index step inside a run of equal values changes the
+ * index while leaving the value (and therefore the thumb, and the filter)
+ * exactly where it was. That reads as a dead arrow key.
+ */
 export function steppedValue(
   values: readonly number[],
   current: number,
@@ -53,9 +61,21 @@ export function steppedValue(
 ): number {
   const last = values.length - 1;
   // Round to a real sample index so a thumb sitting between two samples still
-  // advances by exactly one item rather than stalling on a fractional step.
+  // advances rather than stalling on a fractional step.
   const index = Math.round(valueQuantile(values, current) * last);
-  return nth(values, Math.min(last, Math.max(0, index + delta)));
+  const direction = Math.sign(delta);
+  if (direction === 0) return nth(values, index);
+
+  let cursor = index;
+  for (let taken = 0; taken < Math.abs(delta); taken++) {
+    let next = cursor + direction;
+    while (next >= 0 && next <= last && nth(values, next) === nth(values, cursor)) {
+      next += direction;
+    }
+    if (next < 0 || next > last) break;
+    cursor = next;
+  }
+  return nth(values, cursor);
 }
 
 export function RangeSlider({