feat(site): feature and preset reference UI + docs integration (#1258)

Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

packages/react/src/presets/audio/index.ts

@@ -1,3 +1,4 @@
+/** Audio-only player preset with playback and volume controls. */
 export { audioFeatures } from '@videojs/core/dom';
 export { Audio, type AudioProps } from '@/media/audio';
 export * from './minimal-skin';

packages/react/src/presets/background/index.ts

@@ -1,3 +1,4 @@
+/** Ambient background video preset with no user controls. */
 export { backgroundFeatures } from '@videojs/core/dom';
 export { BackgroundVideo, type BackgroundVideoProps } from '@/media/background-video';
 export * from './skin';

packages/react/src/presets/video/index.ts

@@ -1,3 +1,4 @@
+/** General-purpose video player preset with full playback controls. */
 export { videoFeatures } from '@videojs/core/dom';
 export { Video, type VideoProps } from '@/media/video';
 export * from './minimal-skin';