fix(video): prevent preview/presentation playback loop

- Avoid per-render target.set dispatch that reset playback

- Stop timer-based and per-frame React ticking while playing

- Add regression tests for render-loop sources

Made-with: Cursor

app/shared/video/videoPlaybackPerf.networkRegression.test.ts

@@ -0,0 +1,24 @@
+import assert from 'node:assert/strict';
+import fs from 'node:fs';
+import path from 'node:path';
+import test from 'node:test';
+import { fileURLToPath } from 'node:url';
+
+const root = path.resolve(path.dirname(fileURLToPath(import.meta.url)), '..', '..', '..');
+
+void test('video playback: renderer hooks/components do not tick React each frame', () => {
+  const hookSrc = fs.readFileSync(
+    path.join(root, 'app', 'renderer', 'shared', 'video', 'useVideoPlaybackState.ts'),
+    'utf8',
+  );
+  // Регресс: раньше был setInterval(250ms) для clientNowMs, который заставлял перерисовываться окна.
+  assert.doesNotMatch(hookSrc, /\bsetInterval\s*\(/);
+
+  const previewSrc = fs.readFileSync(
+    path.join(root, 'app', 'renderer', 'control', 'ControlScenePreview.tsx'),
+    'utf8',
+  );
+  // Регресс: раньше был RAF loop с setState на каждом кадре.
+  assert.doesNotMatch(previewSrc, /\brequestAnimationFrame\s*\(\s*loop\s*\)/);
+  assert.doesNotMatch(previewSrc, /\brequestAnimationFrame\s*\(\s*loop\b/);
+});