fix: simplify music autoplay for Mac desktop compatibility

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/components/MusicPlayer.tsx

@@ -7,7 +7,6 @@ import type { MediaItem } from '@/lib/types'
 const TAIL_SKIP = 10
 const CROSSFADE_DURATION = 3
 const VOLUME = 0.4
-const FADE_IN_MS = 2000
 
 export default function MusicPlayer({ tracks }: { tracks: MediaItem[] }) {
   const track = tracks[0] ?? null
@@ -17,11 +16,9 @@ export default function MusicPlayer({ tracks }: { tracks: MediaItem[] }) {
   const audioB = useRef<HTMLAudioElement>(null)
   const activeRef = useRef<'A' | 'B'>('A')
   const fadingRef = useRef(false)
-  const startedRef = useRef(false)
-  const audibleRef = useRef(false)
+  const playingRef = useRef(false)
 
   const [userMuted, setUserMuted] = useState(false)
-  const [playing, setPlaying] = useState(false)
 
   const getActive = useCallback(
     () => (activeRef.current === 'A' ? audioA.current : audioB.current),
@@ -66,7 +63,7 @@ export default function MusicPlayer({ tracks }: { tracks: MediaItem[] }) {
 
   // Monitor for crossfade
   useEffect(() => {
-    if (!playing || !src) return
+    if (!playingRef.current || !src) return
     let id: number
     const tick = () => {
       const a = getActive()
@@ -79,7 +76,7 @@ export default function MusicPlayer({ tracks }: { tracks: MediaItem[] }) {
     }
     id = requestAnimationFrame(tick)
     return () => cancelAnimationFrame(id)
-  }, [playing, src, getActive, crossfade])
+  })
 
   // Fallback loop
   const handleEnded = useCallback(() => {
@@ -96,56 +93,41 @@ export default function MusicPlayer({ tracks }: { tracks: MediaItem[] }) {
     if (b && !fadingRef.current && !b.paused) b.volume = vol
   }, [userMuted, getActive, getInactive])
 
-  // ── Fade volume from 0 → VOLUME ──────────────────────────────
-  const fadeIn = useCallback(() => {
-    if (audibleRef.current) return
-    audibleRef.current = true
-    const active = activeRef.current === 'A' ? audioA.current : audioB.current
-    if (!active) return
-    const t0 = performance.now()
-    const step = () => {
-      const t = Math.min((performance.now() - t0) / FADE_IN_MS, 1)
-      if (!fadingRef.current) active.volume = VOLUME * t
-      if (t < 1) requestAnimationFrame(step)
-    }
-    requestAnimationFrame(step)
+  // ── Ensure playback is running ────────────────────────────────
+  // Called on any user interaction. Starts audio if not started yet.
+  const ensurePlaying = useCallback(() => {
+    if (playingRef.current) return
+    const a = audioA.current
+    if (!a) return
+    a.volume = VOLUME
+    a.play().then(() => {
+      playingRef.current = true
+    }).catch(() => {})
   }, [])
 
-  // ── Start playback (called directly in gesture handler for mobile) ──
-  const startPlayback = useCallback(() => {
-    if (startedRef.current) return
-    const a = audioA.current
-    if (!a) return
-    startedRef.current = true
-    a.volume = 0
-    a.play().then(() => {
-      setPlaying(true)
-      fadeIn()
-    }).catch(() => { startedRef.current = false })
-  }, [fadeIn])
-
-  // ── Autoplay ─────────────────────────────────────────────────
+  // Try autoplay on mount (silent, then make audible on interaction)
   useEffect(() => {
-    if (!src || startedRef.current) return
+    if (!src) return
     const a = audioA.current
     if (!a) return
 
-    // Try silent autoplay (desktop allows this)
-    a.volume = 0
+    // Try to autoplay
+    a.volume = VOLUME
     a.play().then(() => {
-      startedRef.current = true
-      setPlaying(true)
-      // Playing silently — fade in on first interaction
-      const onInteract = () => fadeIn()
-      const events = ['scroll', 'click', 'touchstart', 'keydown'] as const
-      events.forEach((e) => window.addEventListener(e, onInteract, { once: true, passive: true }))
+      playingRef.current = true
     }).catch(() => {
-      // Blocked (mobile) — start on first gesture
-      const onGesture = () => startPlayback()
-      const events = ['click', 'touchstart', 'touchend', 'keydown'] as const
-      events.forEach((e) => document.addEventListener(e, onGesture, { once: true, passive: true }))
+      // Blocked — will start on first interaction via ensurePlaying
     })
-  }, [src, fadeIn, startPlayback])
+
+    // Safety net: on any interaction, make sure audio is playing
+    const handler = () => ensurePlaying()
+    const events = ['click', 'touchstart', 'scroll', 'keydown'] as const
+    events.forEach((e) => window.addEventListener(e, handler, { passive: true }))
+
+    return () => {
+      events.forEach((e) => window.removeEventListener(e, handler))
+    }
+  }, [src, ensurePlaying])
 
   if (!track || !src) return null
 
@@ -155,7 +137,10 @@ export default function MusicPlayer({ tracks }: { tracks: MediaItem[] }) {
       <audio ref={audioB} src={src} preload="auto" onEnded={handleEnded} />
 
       <button
-        onClick={() => setUserMuted((m) => !m)}
+        onClick={() => {
+          ensurePlaying()
+          setUserMuted((m) => !m)
+        }}
         className="fixed bottom-6 right-6 z-50 w-14 h-14 rounded-full bg-stone-950/85 backdrop-blur-sm border border-amber-900/20 shadow-lg flex items-center justify-center text-amber-400/60 hover:text-amber-300 transition-colors"
         title={userMuted ? 'Ton an' : 'Ton aus'}
       >