Add rich preview support for three new file categories by leveraging
external CLI tools with graceful fallback when tools are missing.
- PDF: text extraction via pdftotext, page count via pdfinfo
- Audio: metadata via ffprobe (duration, bitrate, codec, sample rate, channels)
- Video: metadata via ffprobe (duration, bitrate, video/audio codec, resolution)
- New PreviewKind constants: PDF, Audio, Video
- New Metadata fields for extended preview data
- New extension maps and Category() entries for pdf/audio/video
- Icons: PDF (), audio (), video () in preview header
Closes#5
Pressing / opens a filter bar at the bottom of the screen. As the user
types, the active pane's entries are filtered in real-time using
case-insensitive substring matching. The .. entry is always preserved.
Key bindings:
/ - open filter input (re-opens with previous query if active)
Esc - clear filter and restore full list
Enter - commit filter (keeps filtering active, closes input bar)
Up/Down - navigate the filtered list while typing
PgUp/Dn - scroll the filtered list
Filter is automatically cleared when navigating to a different directory
(Enter on a folder, Backspace to parent, opening an archive).
Modified files:
- internal/ui/keymap.go: added Filter key binding (/)
- internal/ui/model.go: filterMode, filterQuery, filterInput fields;
filteredPane() helper for View rendering; filter handling in Update();
renderFilterBar() for the bottom bar UI; clearFilter() helper;
adjustCursorForFilter() to keep cursor in bounds
Created files:
- plans/feature-roadmap.md
