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/components/feed/FeedTabBar.test.tsx

@@ -0,0 +1,39 @@
+import { describe, expect, test } from "vitest";
+import { screen } from "@testing-library/react";
+import userEvent from "@testing-library/user-event";
+import { FeedTabBar } from "../../../components/feed/FeedTabBar.tsx";
+import type { Category } from "../../../model.ts";
+import { makeCategory, makeSession } from "../../fixtures.ts";
+import { currentPath, renderWithContexts } from "../../render.tsx";
+
+const categories: Category[] = [
+  makeCategory({ id: "c1", slug: "music", name: "Music" }),
+  makeCategory({ id: "c2", slug: "cinema", name: "Cinema" }),
+];
+
+describe("FeedTabBar", () => {
+  test("guests don't get Followed; tabs navigate within the scope", async () => {
+    const user = userEvent.setup();
+    renderWithContexts(<FeedTabBar />, {
+      route: "/music/hot",
+      path: "/:categorySlug/:feedTab",
+      categories,
+    });
+    expect(screen.queryByRole("button", { name: "Followed" })).not
+      .toBeInTheDocument();
+    expect(screen.getByRole("button", { name: "Hot" })).toHaveClass("active");
+    await user.click(screen.getByRole("button", { name: "Journal" }));
+    expect(currentPath()).toBe("/music/journal");
+  });
+
+  test("signed in, Followed is there", () => {
+    renderWithContexts(<FeedTabBar />, {
+      session: makeSession(),
+      route: "/~/followed",
+      path: "/~/:feedTab",
+    });
+    expect(screen.getByRole("button", { name: "Followed" })).toHaveClass(
+      "active",
+    );
+  });
+});