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

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

packages/html/src/presets/audio.ts

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

packages/html/src/presets/background.ts

@@ -1 +1,2 @@
+/** Ambient background video preset with no user controls. */
 export { backgroundFeatures } from '@videojs/core/dom';

packages/html/src/presets/video.ts

@@ -1,3 +1,4 @@
+/** General-purpose video player preset with full playback controls. */
 export { videoFeatures } from '@videojs/core/dom';
 export { MinimalVideoSkinElement } from '../define/video/minimal-skin';
 export { MinimalVideoSkinTailwindElement } from '../define/video/minimal-skin.tailwind';