v3: src/ gets one layout rule and keeps to it — each layer holds one kind of module, and every layer is split into the same domains — the previous pass sorted components into folders but left hooks, helpers and a barrel inside them, kept hooks/, utils/ and contexts/ flat, and still grouped most tests by theme. The rule: components/ holds only components (.tsx), contexts/ holds FooContext.ts + FooProvider.tsx pairs, hooks/ every hook, utils/ every non-React module, pages/ one component per route and nothing else. Each of components/, contexts/, hooks/ and utils/ is split into the same domains — auth, category, chat, comment, dump, editor, feed, form, layout, player, playlist, profile, social, theme, ws — plus shared/ for what belongs to no one domain, so the chat is components/chat, contexts/chat, hooks/chat and utils/chat. components/ui becomes components/shared to match. Out of components/: useApiForm goes to hooks/form, chat's message.ts and time.ts to utils/chat (with chatDraft and chatText, now draft.ts and text.ts), the emoji skin tone to utils/editor, the remembered volume to utils/player; player/icons.tsx is PlayerIcons.tsx. components/form/index.ts is gone: everything is imported from its own file, FormProvider straight from react-hook-form, and expectOk sits beside friendlyFetchError in utils/shared/api.ts (apiError.ts), since pages that have no form used it too. Out of pages/: the index's feed views, tab bar and presence row move to components/feed; HotFeed and NewFeed, identical but for the sort, are one DumpFeed with an order prop, which also takes over MainFeedProps from pages/index/types.ts. App is a named export like everything else. Tests mirror the tree one file per module — test/<layer>/<domain>/<Module>.test.tsx — so the themed files (hooks/misc, data, editor, sync; utils/misc, text, storage, remote, journal; contexts/providers; pages/auth and UserSubpages; layout/Fabs) are split by subject, the setup each piece needs kept and the rest dropped; the floating-button test becomes one test per button, 627 tests now. The README states the rule. No behaviour changes; the catalogues only move their source references.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/test/hooks/feed/useFading.test.tsx

@@ -0,0 +1,55 @@
+import { afterEach, beforeEach, describe, expect, test, vi } from "vitest";
+import { act, renderHook } from "@testing-library/react";
+import { useFading } from "../../../hooks/feed/useFading.ts";
+
+afterEach(() => vi.useRealTimers());
+
+describe("useFading", () => {
+  beforeEach(() => vi.useFakeTimers());
+
+  test("cooldown for 2s, then dismissing for 350ms, then gone", () => {
+    const { result } = renderHook(useFading);
+    act(() => result.current.startFading("a"));
+    expect(result.current.fading).toEqual({ a: "cooldown" });
+    act(() => vi.advanceTimersByTime(2000));
+    expect(result.current.fading).toEqual({ a: "dismissing" });
+    act(() => vi.advanceTimersByTime(350));
+    expect(result.current.fading).toEqual({});
+  });
+
+  test("starting twice is one animation", () => {
+    const { result } = renderHook(useFading);
+    act(() => result.current.startFading("a"));
+    act(() => vi.advanceTimersByTime(1000));
+    act(() => result.current.startFading("a"));
+    act(() => vi.advanceTimersByTime(1000));
+    expect(result.current.fading).toEqual({ a: "dismissing" });
+  });
+
+  test("cancel during cooldown and during dismissal", () => {
+    const { result } = renderHook(useFading);
+    act(() => result.current.startFading("a"));
+    act(() => result.current.cancelFading("a"));
+    expect(result.current.fading).toEqual({});
+    act(() => vi.advanceTimersByTime(5000));
+    expect(result.current.fading).toEqual({});
+
+    act(() => result.current.startFading("b"));
+    act(() => vi.advanceTimersByTime(2100));
+    act(() => result.current.cancelFading("b"));
+    expect(result.current.fading).toEqual({});
+    // Cancelled means it can start over.
+    act(() => result.current.startFading("b"));
+    expect(result.current.fading).toEqual({ b: "cooldown" });
+  });
+
+  test("cancelAll", () => {
+    const { result } = renderHook(useFading);
+    act(() => {
+      result.current.startFading("a");
+      result.current.startFading("b");
+    });
+    act(() => result.current.cancelAll());
+    expect(result.current.fading).toEqual({});
+  });
+});