Improve import UX: progress overlay, pyannote fix, debug logging

- Enhanced ProgressOverlay with spinner, better styling, and z-index 9999
- Import button shows "Processing..." with pulse animation while transcribing
- Fix pyannote API: use token= instead of deprecated use_auth_token=
- Read HF_TOKEN from environment for pyannote model download
- Add console logging for click-to-seek debugging
- Add color-scheme: dark for native form controls

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

src/lib/components/WaveformPlayer.svelte

@@ -78,6 +78,7 @@
 
   /** Seek to a specific time in milliseconds. Called from transcript click-to-seek. */
   export function seekTo(timeMs: number) {
+    console.log('[voice-to-notes] seekTo called:', timeMs, 'ms, wavesurfer:', !!wavesurfer, 'duration:', wavesurfer?.getDuration());
     if (wavesurfer) {
       wavesurfer.setTime(timeMs / 1000);
       if (!wavesurfer.isPlaying()) {