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/utils/player/waveform.test.ts

@@ -0,0 +1,33 @@
+import { describe, expect, test, vi } from "vitest";
+import { extractPeaks } from "../../../utils/player/waveform.ts";
+import { calls, fail, route } from "../../fetch.ts";
+
+describe("extractPeaks", () => {
+  test("decodes once per URL and takes each block's peak", async () => {
+    const data = new Float32Array([0.1, -0.5, 0.2, 0.9, -0.3, 0.4]);
+    const decode = vi.fn(async () => ({ getChannelData: () => data }));
+    const close = vi.fn();
+    vi.stubGlobal(
+      "AudioContext",
+      class {
+        decodeAudioData = decode;
+        close = close;
+      },
+    );
+    route("GET /api/files/:id", () => new Response(new Uint8Array([1, 2])));
+
+    const peaks = await extractPeaks("http://localhost:8000/api/files/w1", 3);
+    expect([...peaks].map((p) => +p.toFixed(2))).toEqual([0.5, 0.9, 0.4]);
+    expect(close).toHaveBeenCalled();
+
+    await extractPeaks("http://localhost:8000/api/files/w1", 3);
+    expect(decode).toHaveBeenCalledTimes(1);
+    expect(calls("GET /api/files/:id")).toHaveLength(1);
+  });
+
+  test("a failed fetch throws", async () => {
+    route("GET /api/files/:id", () => fail("gone", 404));
+    await expect(extractPeaks("http://localhost:8000/api/files/w2", 3)).rejects
+      .toThrow(/404/);
+  });
+});