- Use extract_info + prepare_filename to determine output filename
before downloading (yt-dlp skips progress hooks when file exists)
- Normalize filenames to relative paths (strip output dir prefix)
- Include filename in completion SSE event so frontend displays it
- Fixes file download 404s from subdirectory source templates
- Move Video/Audio toggle to same row as Download button
- Auto-condense toggle to icon-only below 540px
- Move gear icon to right of Download button
- Fix file download URLs: normalize filenames to relative paths in progress hook
- Display filename with visible extension (truncate middle, preserve ext)
- Remove border/box from dark mode toggle — glyph only
- Fix light/dark theme fonts: use monospace display font across all themes