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/PresentationView.tsx

@@ -24,6 +24,7 @@ import { useAppPlayers } from './playerToken/useAppPlayers';
 import { useSceneNpcTokensSession } from './playerToken/useSceneNpcTokensSession';
 import { useScenePlayerTokensSession } from './playerToken/useScenePlayerTokensSession';
 import { SceneOverlayHost } from './sceneOverlay/SceneOverlayHost';
+import { SessionTimerLayer } from './sessionTimer/SessionTimerLayer';
 import { useSceneViewState } from './sceneView/useSceneViewState';
 import { SceneTokensOverlay } from './tokens/SceneTokensOverlay';
 import { TokenPathsOverlay } from './tokens/TokenPathsOverlay';
@@ -338,6 +339,7 @@ export function PresentationView({
         ))}
         {activeNpcItems.length > 0 ? <NpcsSceneOverlay embedded items={activeNpcItems} /> : null}
       </SceneOverlayHost>
+      <SessionTimerLayer viewport={contentRect} editable={false} />
       {showTitle ? (
         <div className={styles.titleWrap}>
           <div className={compact ? styles.titleCompact : styles.titleFull}>