feat: unified player controls with heatmap progress + thumbnail preview

- VideoPlayer: 移除 onProgress/seekTo props，新增 bvid/cid 向下透传
- [bvid].tsx: 删除 HeatProgressBar 及 currentTime/duration/seekCmd state
- HeatProgressBar.tsx: 删除（逻辑已合并进 NativeVideoPlayer）
- 计划文档已保存到 docs/superpowers/plans/

app/video/[bvid].tsx

@@ -7,7 +7,6 @@ import { SafeAreaView } from 'react-native-safe-area-context';
 import { useLocalSearchParams, useRouter } from 'expo-router';
 import { Ionicons } from '@expo/vector-icons';
 import { VideoPlayer } from '../../components/VideoPlayer';
-import { HeatProgressBar } from '../../components/HeatProgressBar';
 import { CommentItem } from '../../components/CommentItem';
 import { useVideoDetail } from '../../hooks/useVideoDetail';
 import { useComments } from '../../hooks/useComments';
@@ -23,9 +22,6 @@ export default function VideoDetailScreen() {
   const { video, playData, loading: videoLoading, qualities, currentQn, changeQuality } = useVideoDetail(bvid as string);
   const { comments, loading: cmtLoading, load: loadComments } = useComments(video?.aid ?? 0);
   const [tab, setTab] = useState<Tab>('comments');
-  const [currentTime, setCurrentTime] = useState(0);
-  const [duration, setDuration] = useState(0);
-  const [seekCmd, setSeekCmd] = useState<{ t: number; v: number } | undefined>();
   const { setVideo, clearVideo } = useVideoStore();
 
   useEffect(() => {
@@ -61,20 +57,10 @@ export default function VideoDetailScreen() {
         currentQn={currentQn}
         onQualityChange={changeQuality}
         onMiniPlayer={handleMiniPlayer}
-        onProgress={(ct, dur) => { setCurrentTime(ct); setDuration(dur); }}
-        seekTo={seekCmd}
+        bvid={bvid as string}
+        cid={video?.cid}
       />
 
-      {video?.cid && duration > 0 && (
-        <HeatProgressBar
-          bvid={bvid as string}
-          cid={video.cid}
-          currentTime={currentTime}
-          duration={duration}
-          onSeek={(t) => setSeekCmd(s => ({ t, v: (s?.v ?? 0) + 1 }))}
-        />
-      )}
-
       <ScrollView style={styles.scroll} showsVerticalScrollIndicator={false}>
         {videoLoading ? (
           <ActivityIndicator style={styles.loader} color="#00AEEC" />