Fix flaky GeneralTab and HooksTab tests

apps/desktop-tauri/src/surfaces/settings/tabs/GeneralTab.test.tsx

@@ -318,6 +318,26 @@ describe("GeneralTab language picker", () => {
     });
   });
 
+  it("cancels the sound preview timer on unmount", () => {
+    vi.useFakeTimers();
+    try {
+      const { unmount } = render(
+        <GeneralTab mode="notifications" settings={settings} set={vi.fn()} saving={false} />,
+      );
+      fireEvent.click(
+        screen.getByRole("button", {
+          name: "NotificationSoundEventHighUsage: NotificationTestSound",
+        }),
+      );
+      expect(vi.getTimerCount()).toBeGreaterThan(0);
+
+      unmount();
+      expect(vi.getTimerCount()).toBe(0);
+    } finally {
+      vi.useRealTimers();
+    }
+  });
+
   it("assigns and clears a custom WAV for one notification", async () => {
     const set = vi.fn();
     vi.mocked(open).mockResolvedValue("C:\\sounds\\high-usage.wav");

apps/desktop-tauri/src/surfaces/settings/tabs/GeneralTab.tsx

@@ -1,4 +1,4 @@
-import { useCallback, useEffect, useState } from "react";
+import { useCallback, useEffect, useRef, useState } from "react";
 import { useLocale } from "../../../hooks/useLocale";
 import { invoke } from "@tauri-apps/api/core";
 import { open } from "@tauri-apps/plugin-dialog";
@@ -168,15 +168,33 @@ export default function GeneralTab({
       .catch(() => {}); // version row degrades to absent, never blocks the tab
   }, []);
 
+  const soundPreviewTimeoutRef = useRef<number | null>(null);
+
+  useEffect(
+    () => () => {
+      if (soundPreviewTimeoutRef.current !== null) {
+        window.clearTimeout(soundPreviewTimeoutRef.current);
+      }
+    },
+    [],
+  );
+
   const handleTestSound = useCallback((event: NotificationSoundEvent) => {
     setSoundError(null);
     setPlayingSound(event);
-    const timeoutId = window.setTimeout(
-      () => setPlayingSound(null),
-      NOTIFICATION_SOUND_PREVIEW_DURATION_MS,
-    );
+    if (soundPreviewTimeoutRef.current !== null) {
+      window.clearTimeout(soundPreviewTimeoutRef.current);
+    }
+    const timeoutId = window.setTimeout(() => {
+      soundPreviewTimeoutRef.current = null;
+      setPlayingSound(null);
+    }, NOTIFICATION_SOUND_PREVIEW_DURATION_MS);
+    soundPreviewTimeoutRef.current = timeoutId;
     void playNotificationSound(event).catch((error: unknown) => {
       window.clearTimeout(timeoutId);
+      if (soundPreviewTimeoutRef.current === timeoutId) {
+        soundPreviewTimeoutRef.current = null;
+      }
       setPlayingSound(null);
       setSoundError(error instanceof Error ? error.message : String(error));
     });

apps/desktop-tauri/src/surfaces/settings/tabs/HooksTab.test.tsx

@@ -256,11 +256,16 @@ describe("HooksTab", () => {
     );
     await renderTab(snapshot({ rules: full }));
     expect(screen.getAllByTestId("hook-rule")).toHaveLength(32);
-    expect(screen.getByRole("button", { name: "+ HooksAddRule" })).toBeDisabled();
-    for (const add of screen.getAllByRole("button", { name: "+ HooksAddArgument" })) {
-      expect(add).toBeDisabled();
+    // Role queries over 32 × 32 argument rows are slow enough under a loaded
+    // CI runner to hit the default 5 s timeout; text queries find the same
+    // buttons, and the larger timeout covers the heavy render itself.
+    expect(screen.getByText("+ HooksAddRule").closest("button")).toBeDisabled();
+    const addArguments = screen.getAllByText("+ HooksAddArgument");
+    expect(addArguments).toHaveLength(32);
+    for (const add of addArguments) {
+      expect(add.closest("button")).toBeDisabled();
     }
-  });
+  }, 20_000);
 
   it("keeps an unreadable hooks.json read-only and shows why", async () => {
     await renderTab(snapshot({ error: "expected value at line 1 column 1" }));