Musify for Windows v10.1.3-port3

v10.1.3-port3 — Animated bg toggle + accent color picker 🎨

✨ New

• Animated background toggle in Settings — disable/enable canvas particle effects
• Quick accent color squares — inline color picker below settings, tap to change theme instantly
• Background now renders overlay on top of content (always visible)
• Color auto-brightens on dark themes for contrast

🐛 Fixed

• Click-through — IgnorePointer so background doesn't block UI
• Freeze on song skip — removed redundant AnimationController.repeat() calls
• Android platform guards — equalizer code only initializes on Android