feat(control): таймер сессии поверх сцены

Отдельное окно countdown с «Показать игрокам»; на превью — move/resize/rotate, на презентации тот же layout.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/renderer/shared/ui/secondaryWindows.stability.test.ts

@@ -13,6 +13,7 @@ const SECONDARY_WINDOW_MAINS = [
   'npcs/npcsMain.tsx',
   'materials/main.tsx',
   'playlists/main.tsx',
+  'timer/main.tsx',
   'sceneEditor/main.tsx',
   'sceneDescription/main.tsx',
   'control/main.tsx',
@@ -140,6 +141,13 @@ void test('ControlApp: Playlists tool opens window', () => {
   assert.ok(src.includes('windows.openPlaylists'));
 });
 
+void test('ControlApp: Timer tool opens window', () => {
+  const src = fs.readFileSync(path.join(rendererRoot, 'control/ControlApp.tsx'), 'utf8');
+  assert.ok(src.includes('data-testid="control-timer-tool"'));
+  assert.ok(src.includes('windows.openTimer'));
+  assert.ok(src.includes('SessionTimerLayer'));
+});
+
 void test('PlayerTokenView: name plate shows full text without ellipsis', () => {
   const css = fs.readFileSync(
     path.join(rendererRoot, 'shared/playerToken/PlayerTokenView.module.css'),