test(e2e): update suite for shipped features + gate Chromium-only perms

The running test container had been built from an older tree; rebuilding it to
pick up current app code surfaced several tests that predated shipped
security/UX features:

- file-upload-attacks / rate-limit: assert the magic-byte rejection wording and
  upload a real decodable JPEG (a zero-buffer is now rejected at the boundary).
- ddos: open SSE via the single-use /stream/ticket flow, not the dead ?token=.
- recover-page / join: the PIN field auto-submits on the 4th digit, so don't
  race an explicit submit click against the ensuing navigation.
- gestures-doubletap / sheet-escape: target the lightbox by aria-labelledby and
  anchor the radio accessible-name match at the start (gated dialog semantics).

playwright.config: camera/mic/clipboard are Chromium-only permissions (they threw
"Unknown permission: camera" on firefox/webkit and failed the test at context
creation); grant them per-Chromium-project. firefox-android drops the
unsupported isMobile flag.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

e2e/specs/09-mobile/gestures-doubletap.spec.ts

@@ -75,10 +75,11 @@ test.describe('Mobile — double-tap gesture', () => {
     await expect(imageButton).toBeVisible({ timeout: 10_000 });
     await imageButton.click();
 
-    // LightboxModal is `role="dialog"` (no aria-modal). The other dialog on the
-    // page is the ContextSheet which has `aria-modal="true"` even when closed,
-    // so scope to NOT-aria-modal to pick the lightbox specifically.
-    const lightbox = page.locator('[role="dialog"]:not([aria-modal])');
+    // LightboxModal is the only dialog labelled by #lightbox-title, so target it
+    // directly. (Closed sheets no longer expose role=dialog — that semantics is
+    // gated on `open` — so a plain [role=dialog] match would be ambiguous only
+    // while a sheet is open; the labelledby scope keeps this unambiguous.)
+    const lightbox = page.locator('[role="dialog"][aria-labelledby="lightbox-title"]');
     await expect(lightbox).toBeVisible();
 
     // Find the inner image element to tap.

e2e/specs/09-mobile/sheet-escape.spec.ts

@@ -12,7 +12,9 @@ test.describe('Mobile a11y — sheets dismiss on Escape', () => {
     await page.goto('/account');
 
     // Click the "Original" radio in the Datennutzung section to open the warning sheet.
-    const originalRadio = page.getByRole('radio', { name: /Original$/i });
+    // The radio's accessible name is its title + description ("Original Lädt die
+    // Originaldateien…"), so anchor on the start, not the end.
+    const originalRadio = page.getByRole('radio', { name: /^Original/i });
     await originalRadio.click();
 
     const sheet = page.locator('[role="dialog"][aria-labelledby="data-mode-title"]');