fix(live-tv): honour Cmd/Ctrl+B on collection pages and hide the header rail toggle on phones

Codex review follow-ups on #1555:

- The hidden-list state advertises Cmd/Ctrl+B, but the favorites/recent
  collection page had no handler; only the routed M3U/Xtream/Stalker live
  layouts did. The page now toggles the collection surface while its live
  tab is on screen, with the same typing/inert guards as the other hosts.
- At the phone breakpoint the header already holds the drawer toggle,
  switcher, search and Add; the live rail is a bottom drawer with its own
  toggle there, so the header rail toggle is hidden below 640px.

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

apps/web-e2e/src/mobile-layout.e2e.ts

@@ -134,9 +134,7 @@ test.describe('portrait phone 375x812', () => {
         // sections; now the list scrolls and ends above the footer.
         const listBox = await boxOf(panel.locator('.settings-sections-list'));
         const footerBox = await boxOf(footer);
-        expect(listBox.y + listBox.height).toBeLessThanOrEqual(
-            footerBox.y + 1
-        );
+        expect(listBox.y + listBox.height).toBeLessThanOrEqual(footerBox.y + 1);
 
         // Tapping the backdrop (right of the drawer) closes it.
         await page
@@ -216,7 +214,16 @@ test.describe('xtream portal routes on a phone', () => {
         const sidebar = page.locator('app-live-stream-layout .sidebar');
         await expect(sidebar).toBeVisible();
 
+        // The workspace header carries the live rail toggle at desktop
+        // width only; on the phone the rail is a bottom drawer with its own
+        // toggle and the header has no room for another permanent icon.
+        const headerRailToggle = page.locator(
+            'app-workspace-shell-header .header-sidebar-toggle'
+        );
+        await expect(headerRailToggle).toBeVisible();
+
         await page.setViewportSize(LANDSCAPE_PHONE);
+        await expect(headerRailToggle).toBeHidden();
 
         // The sidebar stacks at full width above the player.
         await expect