Added new features: Visual & timing fixes

[szoltysek]

Features: Visual & timing fixes

Fixes a handful of long-standing bugs around animation timing and cover art layout.

Progress bar desync

• The old setTimeout-based reset was brittle by design. Replaced it with a synchronous layout reflow (void border.offsetWidth) - resets are now instant. Also added drift correction: if CSS animation falls more than 1.5s out of sync with the server's reported playback time, it corrects itself automatically. Fixed start, end, and current timestamps in the prgr packet while I was in there - current wasn't reporting correctly.

Options menu

• Implemented options menu for changing setting for Cover Spinning and Cover's shape.
  

Font stack (or Typography)

• Switched to -apple-system, BlinkMacSystemFont - San Francisco renders natively on Apple platforms now. Falls back to Inter (Google Fonts) on Linux (not considering Windows a system). Cleaner, sharper, more pleasing for my ADHD eyes.

CSS cleanup

• Dropped overly-specific selectors like .animate.spinning and .thumbnail-border.circle in favor of global layout classes - .circle, .rounded-square. They cascade cleanly down the DOM and are much easier to work with going forward.

Known issues & limitations

Cover art spin delay on pause

• Cover doesn't stop spinning immediately when playback pauses. This is a shairport-sync timing issue, not something I can fix on my end cleanly.

No playback controls (AirPlay)

• Pause/Play/Forward/Backward controls aren't implemented for AirPlay (and Spotify yet). The protocol bits that handle this are closed-source, and the shairport-sync repo explicitly notes this limitation. Spotify is a different story - controls are probably doable there since the API is open.

Also - my roadmap for this project (I find it really cool):

UI Overhaul - Apple Music / Spotify aesthetic

• Full visual redesign taking cues from Apple Music and Spotify's UI language - clean typography, blurred backgrounds, smooth transitions. The current layout works but doesn't feel premium. This would bring it up to that level.

HomeKit RGB integration

• Implementing ambient lighting sync via HomeKit - LED strip reacts to playback state or cover art colors. Easiest path is through Homebridge. Blocked on hardware for now - need to acquire a controllable LED strip first (I was thinking about it).

Replace Spotify token flow with data from FOSS Spotify Server - spocon

• Current Spotify token handling is a workaround. spocon runs a local server that handles auth transparently, no token juggling. Straightforward swap once I sit down with it.

Additional providers

• Tidal - on the list, haven't dug into the API yet
• Pandora - no idea where to even start with this one, skipping for now

[szoltysek]

And I forgot to mention, fixed the npm vulnerabilites and removed some comments, because why not.