test(app-shell): cover sidebar brand link to dashboard

Two new SSR tests in `app-shell.test.tsx`:

- Desktop sidebar's brand header is now a link, not a static <div>.
  Asserts the <aside> contains an <a href="/" aria-label="Go to
  dashboard"> at the top. The slice is scoped to the <aside> via a
  new `extractSidebar` helper so it can't accidentally match the
  mobile-header brand link.

- Mobile and desktop brand links carry distinct aria-labels
  ("Go home" vs "Go to dashboard"). On a wide window where the
  desktop sidebar is visible alongside the (sm:hidden) mobile
  header — which technically can't happen at any one breakpoint
  but is a useful invariant for screen readers in split-screen /
  zoom contexts — the two announcements stay distinguishable.

Total: 212 web tests passing (was 210).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/web/src/components/app-shell.test.tsx

@@ -242,6 +242,35 @@ describe("AppShell — desktop sidebar (SSR)", () => {
     // appear in the sidebar (we removed it from the mobile drawer).
     expect(html).toContain('data-testid="theme-toggle"');
   });
+
+  it("sidebar brand header is a link to / with a 'Go to dashboard' aria-label", () => {
+    pathnameMock.mockReturnValue("/accounts");
+    const html = renderToStaticMarkup(
+      <AppShell>
+        <div />
+      </AppShell>,
+    );
+    // Scope to the sidebar: it's the <aside> element. Pull just the
+    // <aside>...</aside> slice so this assertion can't accidentally
+    // match the mobile-header brand link (which has aria-label="Go home").
+    const sidebarSlice = extractSidebar(html);
+    expect(sidebarSlice).toMatch(
+      /<a\b[^>]*href="\/"[^>]*aria-label="Go to dashboard"|<a\b[^>]*aria-label="Go to dashboard"[^>]*href="\/"/,
+    );
+  });
+
+  it("mobile header brand link uses 'Go home' (separate copy from sidebar)", () => {
+    // Make sure the two brand-link aria-labels stay distinct so screen-
+    // reader users on a wide-window split-screen don't hear two
+    // identical announcements when both are visible.
+    const html = renderToStaticMarkup(
+      <AppShell>
+        <div />
+      </AppShell>,
+    );
+    expect(html).toContain('aria-label="Go home"');
+    expect(html).toContain('aria-label="Go to dashboard"');
+  });
 });
 
 // ---------------------------------------------------------------------------
@@ -265,3 +294,15 @@ function extractSheet(html: string): string {
   if (open === -1) return "";
   return html.slice(open);
 }
+
+/**
+ * Pull just the desktop <aside>...</aside> slice. The shell renders
+ * the sidebar first, then the mobile header, so the closing
+ * </aside> tag cleanly separates the two brand markup blocks.
+ */
+function extractSidebar(html: string): string {
+  const open = html.indexOf("<aside");
+  if (open === -1) return "";
+  const close = html.indexOf("</aside>", open);
+  return html.slice(open, close === -1 ? html.length : close + "</aside>".length);
+}