Add video player support to bskyembed with HLS.js

Adds real video playback to the bskyembed iframe embed system:

- Lazy-load the video player using preact/compat lazy/Suspense so hls.js
  and all player code are in a separate chunk, keeping the default bundle small
- Full video controls: play/pause, scrubber, volume, fullscreen, time display
- HLS.js integration with bandwidth estimation and error handling
- GIF presentation support with simplified controls
- Thumbnail + play button shown until user clicks to activate the player
- Ported patterns from the main app's web video player, adapted for
  Preact + Tailwind (no React Native, no ALF, no Lingui)

https://claude.ai/code/session_01Mva57VZnFgdaQ7LPPoVNsP

bskyembed/package.json

@@ -12,6 +12,7 @@
   },
   "dependencies": {
     "@atproto/api": "^0.15.25",
+    "hls.js": "^1.6.2",
     "preact": "^10.4.8"
   },
   "devDependencies": {

bskyembed/src/components/embed.tsx

@@ -11,7 +11,8 @@ import {
   AppBskyLabelerDefs,
 } from '@atproto/api'
 import {ComponentChildren, h} from 'preact'
-import {useMemo} from 'preact/hooks'
+import {lazy, Suspense} from 'preact/compat'
+import {useMemo, useState} from 'preact/hooks'
 
 import infoIcon from '../../assets/circleInfo_stroke2_corner0_rounded.svg'
 import playIcon from '../../assets/play_filled_corner2_rounded.svg'
@@ -23,6 +24,8 @@ import {getVerificationState} from '../util/verification-state'
 import {Link} from './link'
 import {VerificationCheck} from './verification-check'
 
+const LazyVideoPlayer = lazy(() => import('./video-player'))
+
 export function Embed({
   content,
   labels,
@@ -389,26 +392,66 @@ function GenericWithImageEmbed({
   )
 }
 
-// just the thumbnail and a play button
 function VideoEmbed({content}: {content: AppBskyEmbedVideo.View}) {
-  let aspectRatio = 1
+  const [activated, setActivated] = useState(content.presentation === 'gif')
 
+  let aspectRatio = 1
   if (content.aspectRatio) {
     const {width, height} = content.aspectRatio
     aspectRatio = clamp(width / height, 1 / 1, 3 / 1)
   }
 
+  if (activated) {
+    return (
+      <Suspense
+        fallback={
+          <VideoEmbedFallback
+            content={content}
+            aspectRatio={aspectRatio}
+            loading
+          />
+        }>
+        <LazyVideoPlayer content={content} />
+      </Suspense>
+    )
+  }
+
+  return (
+    <VideoEmbedFallback
+      content={content}
+      aspectRatio={aspectRatio}
+      onPress={() => setActivated(true)}
+    />
+  )
+}
+
+function VideoEmbedFallback({
+  content,
+  aspectRatio,
+  onPress,
+  loading,
+}: {
+  content: AppBskyEmbedVideo.View
+  aspectRatio: number
+  onPress?: () => void
+  loading?: boolean
+}) {
   return (
     <div
-      className="w-full overflow-hidden rounded-xl aspect-square relative"
-      style={{aspectRatio: `${aspectRatio} / 1`}}>
+      className="w-full overflow-hidden rounded-xl relative cursor-pointer"
+      style={{aspectRatio: `${aspectRatio} / 1`}}
+      onClick={onPress}>
       <img
         src={content.thumbnail}
         alt={content.alt}
         className="object-cover size-full"
       />
       <div className="size-24 absolute top-1/2 left-1/2 -translate-x-1/2 -translate-y-1/2 rounded-full bg-black/50 flex items-center justify-center">
-        <img src={playIcon} className="object-cover size-3/5" />
+        {loading ? (
+          <div className="video-spinner" />
+        ) : (
+          <img src={playIcon} className="object-cover size-3/5" />
+        )}
       </div>
     </div>
   )

bskyembed/src/index.css

@@ -10,6 +10,35 @@
   color-scheme: light dark;
 }
 
+/* Video player spinner */
+@keyframes video-spin {
+  to {
+    transform: rotate(360deg);
+  }
+}
+
+.video-spinner {
+  width: 32px;
+  height: 32px;
+  border: 3px solid rgba(255, 255, 255, 0.3);
+  border-top-color: white;
+  border-radius: 50%;
+  animation: video-spin 0.8s linear infinite;
+}
+
+/* Firefox scrubber workaround */
+.force-no-clicks * {
+  pointer-events: none !important;
+}
+
+/* Volume slider vertical orientation */
+input[type='range'][orient='vertical'] {
+  writing-mode: vertical-lr;
+  direction: rtl;
+  appearance: slider-vertical;
+  -webkit-appearance: slider-vertical;
+}
+
 select {
   background-image: url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' height='14px' width='14px' fill='none' viewBox='0 0 24 24'><path fill='black' fill-rule='evenodd' d='M3.293 8.293a1 1 0 0 1 1.414 0L12 15.586l7.293-7.293a1 1 0 1 1 1.414 1.414l-8 8a1 1 0 0 1-1.414 0l-8-8a1 1 0 0 1 0-1.414Z' clip-rule='evenodd'/></svg>");
   background-repeat: no-repeat;