v2.2.0

youtube music fallback, custom presets, download debugging

changes

• youtube music fallback: when spotify search fails, tries youtube music metadata for better matching. three modes: auto (default), ask (prompts user), never.
• custom quality presets: create up to 5 custom download presets. presets now include descriptions visible in settings.
• spotify local files tutorial: added collapsible in-app guide explaining how to enable local files scanning in spotify desktop.
• square thumbnails: all thumbnails now display as 1:1 center-cropped squares.
• download debugging: added comprehensive logging throughout download pipeline for troubleshooting.
• fallback ui: activity tab shows confirmation prompt when awaiting user decision on fallback metadata.
• version display: added version number at bottom of settings page for easy verification.
• csp fix: moved all inline scripts and styles to external files for manifest v3 compliance.