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/shared/Thumbnail.test.tsx

@@ -0,0 +1,56 @@
+import { describe, expect, test } from "vitest";
+import { fireEvent, screen } from "@testing-library/react";
+import { Thumbnail } from "../../../components/shared/Thumbnail.tsx";
+import { renderWithContexts } from "../../render.tsx";
+
+describe("Thumbnail", () => {
+  const placeholder = { url: "https://site.test/page", siteName: "Site" };
+
+  test("direct, then proxied, then the placeholder", () => {
+    renderWithContexts(
+      <Thumbnail
+        src="https://img.test/a.png"
+        alt="art"
+        placeholder={placeholder}
+      />,
+    );
+    const img = screen.getByRole("img", { name: "art" });
+    expect(img).toHaveAttribute("src", "https://img.test/a.png");
+    expect(img).toHaveAttribute("referrerpolicy", "no-referrer");
+    fireEvent.error(img);
+    expect(screen.getByRole("img", { name: "art" }).getAttribute("src"))
+      .toContain(
+        "/api/proxy-image?url=",
+      );
+    fireEvent.error(screen.getByRole("img", { name: "art" }));
+    expect(screen.queryByRole("img", { name: "art" })).not.toBeInTheDocument();
+    expect(screen.getByText("S")).toBeInTheDocument();
+  });
+
+  test("our own images skip the proxy retry", () => {
+    renderWithContexts(
+      <Thumbnail
+        src="http://localhost:8000/api/thumbnails/d"
+        alt="t"
+        placeholder={placeholder}
+      />,
+    );
+    fireEvent.error(screen.getByRole("img", { name: "t" }));
+    expect(screen.queryByRole("img", { name: "t" })).not.toBeInTheDocument();
+  });
+
+  test("no src: straight to the placeholder; a new src tries again", () => {
+    const { rerender } = renderWithContexts(
+      <Thumbnail placeholder={placeholder} alt="t" />,
+    );
+    expect(screen.queryByRole("img", { name: "t" })).not.toBeInTheDocument();
+    rerender(
+      <Thumbnail
+        src="https://img.test/b.png"
+        placeholder={placeholder}
+        alt="t"
+      />,
+    );
+    expect(screen.getByRole("img", { name: "t" })).toBeInTheDocument();
+  });
+});