feat(player): SpeedMenu primitive replaces audiobook select

Introduces a shared SpeedMenu component (button trigger + popover with
arrow-key navigation and escape-to-close) used by the audiobook player.
Replaces the previous native <select> with a menu that matches the
in-design dark surface treatment and the planned shared player chrome.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

web/src/pages/audiobooks/AudiobookPlayer.tsx

@@ -5,6 +5,7 @@ import { useReportAudiobookProgress } from "@/hooks/audiobooks/useReportAudioboo
 import type { AudiobookFile } from "@/lib/audiobooks/types";
 import { SeekBar, formatTime } from "@/player/components/SeekBar";
 import { ChaptersMenu } from "@/player/components/ChaptersMenu";
+import { SpeedMenu } from "@/player/components/SpeedMenu";
 import type { PlayerChapter } from "@/player/types";
 
 export interface AudiobookPlayerProps {
@@ -200,12 +201,6 @@ export default function AudiobookPlayer({
     seekTo(audio.currentTime + delta);
   }
 
-  function handleRateChange(e: React.ChangeEvent<HTMLSelectElement>) {
-    const r = Number(e.target.value);
-    setRate(r);
-    if (audioRef.current) audioRef.current.playbackRate = r;
-  }
-
   const canPlay = Boolean(file);
 
   return (
@@ -239,7 +234,7 @@ export default function AudiobookPlayer({
               {title}
             </div>
           ) : null}
-          <div className="text-muted-foreground flex items-center gap-2 text-[10px] uppercase leading-tight">
+          <div className="text-muted-foreground flex items-center gap-2 text-[10px] leading-tight uppercase">
             <span className="font-mono text-[11px] tracking-[0.12em] normal-case tabular-nums">
               {formatTime(currentTime)}
               <span className="mx-1 opacity-50">/</span>
@@ -285,19 +280,14 @@ export default function AudiobookPlayer({
           {chapters.length > 0 && (
             <ChaptersMenu chapters={chapters} currentTime={currentTime} onSeek={seekTo} />
           )}
-          <select
+          <SpeedMenu
+            rates={PLAYBACK_RATES}
             value={rate}
-            onChange={handleRateChange}
-            aria-label="Playback speed"
-            className="bg-background text-muted-foreground hover:text-foreground focus:ring-ring shrink-0 rounded border-0 px-1.5 py-1 text-xs outline-none focus:ring-1"
-            disabled={!canPlay}
-          >
-            {PLAYBACK_RATES.map((r) => (
-              <option key={r} value={r}>
-                {r}×
-              </option>
-            ))}
-          </select>
+            onChange={(r) => {
+              setRate(r);
+              if (audioRef.current) audioRef.current.playbackRate = r;
+            }}
+          />
           {onClose && (
             <button
               type="button"

web/src/player/components/SpeedMenu.test.tsx

@@ -0,0 +1,29 @@
+import { describe, expect, it, vi } from "vitest";
+import { render, screen } from "@testing-library/react";
+import userEvent from "@testing-library/user-event";
+import { SpeedMenu } from "./SpeedMenu";
+
+const RATES = [0.75, 1, 1.25, 1.5, 2] as const;
+
+describe("SpeedMenu", () => {
+  it("shows the current rate label on the trigger", () => {
+    render(<SpeedMenu rates={RATES} value={1.5} onChange={() => {}} />);
+    expect(screen.getByRole("button", { name: /playback speed/i })).toHaveTextContent("1.5×");
+  });
+
+  it("opens, lists all rates, and emits the chosen value", async () => {
+    const onChange = vi.fn();
+    render(<SpeedMenu rates={RATES} value={1} onChange={onChange} />);
+    await userEvent.click(screen.getByRole("button", { name: /playback speed/i }));
+    expect(screen.getAllByRole("menuitem")).toHaveLength(RATES.length);
+    await userEvent.click(screen.getByRole("menuitem", { name: "1.25×" }));
+    expect(onChange).toHaveBeenCalledWith(1.25);
+  });
+
+  it("marks the current rate as active", async () => {
+    render(<SpeedMenu rates={RATES} value={1.5} onChange={() => {}} />);
+    await userEvent.click(screen.getByRole("button", { name: /playback speed/i }));
+    const active = screen.getByRole("menuitem", { name: "1.5×" });
+    expect(active).toHaveAttribute("data-active", "true");
+  });
+});

web/src/player/components/SpeedMenu.tsx

@@ -0,0 +1,95 @@
+import { useCallback, useEffect, useRef, useState } from "react";
+
+interface SpeedMenuProps {
+  rates: readonly number[];
+  value: number;
+  onChange: (rate: number) => void;
+}
+
+export function SpeedMenu({ rates, value, onChange }: SpeedMenuProps) {
+  const [open, setOpen] = useState(false);
+  const menuRef = useRef<HTMLDivElement>(null);
+  const menuItemsRef = useRef<(HTMLButtonElement | null)[]>([]);
+
+  const handleBlur = useCallback((e: React.FocusEvent) => {
+    if (!menuRef.current?.contains(e.relatedTarget as Node)) {
+      setOpen(false);
+    }
+  }, []);
+
+  useEffect(() => {
+    if (!open) return;
+    const onKey = (e: KeyboardEvent) => e.key === "Escape" && setOpen(false);
+    document.addEventListener("keydown", onKey);
+    return () => document.removeEventListener("keydown", onKey);
+  }, [open]);
+
+  const handleMenuKeyDown = useCallback((e: React.KeyboardEvent) => {
+    const items = menuItemsRef.current.filter(Boolean) as HTMLButtonElement[];
+    if (items.length === 0) return;
+    const i = items.indexOf(document.activeElement as HTMLButtonElement);
+    let next: number | null = null;
+    switch (e.key) {
+      case "ArrowDown":
+        next = i < items.length - 1 ? i + 1 : 0;
+        break;
+      case "ArrowUp":
+        next = i > 0 ? i - 1 : items.length - 1;
+        break;
+      case "Home":
+        next = 0;
+        break;
+      case "End":
+        next = items.length - 1;
+        break;
+      default:
+        return;
+    }
+    e.preventDefault();
+    items[next]?.focus();
+  }, []);
+
+  return (
+    <div ref={menuRef} className="relative" onBlur={handleBlur}>
+      <button
+        type="button"
+        className="player-utility-btn px-2 text-xs tabular-nums"
+        onClick={() => setOpen((v) => !v)}
+        aria-label="Playback speed"
+        aria-expanded={open}
+        aria-haspopup="menu"
+      >
+        {value}×
+      </button>
+
+      {open && (
+        <div
+          role="menu"
+          className="absolute right-0 bottom-full mb-2 flex min-w-[100px] flex-col overflow-hidden rounded-lg bg-black/90 py-1.5 shadow-xl backdrop-blur-sm"
+          onKeyDown={handleMenuKeyDown}
+        >
+          {rates.map((r, idx) => (
+            <button
+              key={r}
+              ref={(el) => {
+                menuItemsRef.current[idx] = el;
+              }}
+              role="menuitem"
+              type="button"
+              data-active={r === value ? "true" : undefined}
+              className={`w-full px-4 py-2 text-right text-sm tabular-nums transition-colors hover:bg-white/10 focus-visible:ring-2 focus-visible:ring-white/70 focus-visible:outline-none ${
+                r === value ? "bg-white/5 text-white" : "text-white/75"
+              }`}
+              onClick={() => {
+                onChange(r);
+                setOpen(false);
+              }}
+            >
+              {r}×
+            </button>
+          ))}
+        </div>
+      )}
+    </div>
+  );
+}