diff --git a/index.html b/index.html
index 6478b7d..049df05 100644
--- a/index.html
+++ b/index.html
@@ -319,7 +319,7 @@
             </div>
         );
 
-        const SideDrawer = ({ isOpen, onClose, view, setView, quality, setQuality }) => {
+        const SideDrawer = ({ isOpen, onClose, view, setView, quality, setQuality, onClearCache }) => {
             if (!isOpen) return null;
 
             return (
@@ -355,8 +355,8 @@
                             <div className="mt-8 px-4 mb-2 text-xs font-bold text-gray-500 uppercase tracking-wider">设置</div>
                             <div className="px-4 py-2">
                                 <label className="block text-sm text-gray-300 mb-2">默认播放音质</label>
-                                <select 
-                                    value={quality} 
+                                <select
+                                    value={quality}
                                     onChange={(e) => setQuality(e.target.value)}
                                     className="drawer-select"
                                 >
@@ -365,6 +365,21 @@
                                     <option value="flac">无损 (FLAC)</option>
                                 </select>
                             </div>
+
+                             <div className="px-4 py-2 mt-2">
+                                <button
+                                    onClick={() => {
+                                        if(confirm('确定要清除所有缓存数据吗？这将重置播放列表和收藏。')) {
+                                            onClearCache();
+                                            onClose();
+                                        }
+                                    }}
+                                    className="w-full py-2 px-4 rounded-lg border border-red-500/50 text-red-500 hover:bg-red-500/10 transition-colors text-sm flex items-center justify-center gap-2"
+                                >
+                                    <Icon name="trash-can" />
+                                    清理缓存数据
+                                </button>
+                            </div>
                         </div>
 
                         <div className="p-4 border-t border-white/10 text-xs text-gray-500 text-center">
@@ -719,17 +734,6 @@
                 audio.volume = volume;
                 const updateTime = () => {
                     setCurrentTime(audio.currentTime);
-                    if ('mediaSession' in navigator && !isNaN(audio.duration)) {
-                        try {
-                            navigator.mediaSession.setPositionState({
-                                duration: audio.duration,
-                                playbackRate: audio.playbackRate,
-                                position: audio.currentTime
-                            });
-                        } catch (e) {
-                            // Ignore errors
-                        }
-                    }
                 };
                 const updateDuration = () => setDuration(audio.duration);
                 const onEnded = () => playNext(true);
@@ -878,8 +882,11 @@
             };
 
             const handleSeek = (time) => {
-                audioRef.current.currentTime = time;
-                setCurrentTime(time);
+                if (Number.isFinite(time)) {
+                    audioRef.current.currentTime = time;
+                    setCurrentTime(time);
+                    updateMediaSessionPosition();
+                }
             };
 
             const deleteFromPlaylist = (index) => {
@@ -915,6 +922,18 @@
 
             // --- Media Session Integration ---
             
+            const updateMediaSessionPosition = () => {
+                if ('mediaSession' in navigator && audioRef.current && !isNaN(audioRef.current.duration)) {
+                    try {
+                        navigator.mediaSession.setPositionState({
+                            duration: audioRef.current.duration,
+                            playbackRate: audioRef.current.playbackRate,
+                            position: audioRef.current.currentTime
+                        });
+                    } catch (e) { console.error("MediaSession Position Error:", e); }
+                }
+            };
+
             // Update refs for Media Session actions
             useEffect(() => {
                 playNextRef.current = playNext;
@@ -958,24 +977,34 @@
                 }
             }, [currentSong]);
 
-            // Media Session Playback State
+            // Media Session Playback State & Position
             useEffect(() => {
                 if ('mediaSession' in navigator) {
                     navigator.mediaSession.playbackState = isPlaying ? 'playing' : 'paused';
+                    updateMediaSessionPosition();
                 }
             }, [isPlaying]);
 
+            // Update position when song loads
+            useEffect(() => {
+                const audio = audioRef.current;
+                const onLoadedMetadata = () => updateMediaSessionPosition();
+                audio.addEventListener('loadedmetadata', onLoadedMetadata);
+                return () => audio.removeEventListener('loadedmetadata', onLoadedMetadata);
+            }, []);
+
             // --- Render ---
 
             return (
                 <div className="flex flex-col h-full bg-darker font-sans">
-                    <SideDrawer 
-                        isOpen={showSideDrawer} 
+                    <SideDrawer
+                        isOpen={showSideDrawer}
                         onClose={() => setShowSideDrawer(false)}
                         view={view}
                         setView={setView}
                         quality={quality}
                         setQuality={setQuality}
+                        onClearCache={handleClearCache}
                     />
 
                     {/* Top Navigation / Search Bar */}