v1.3.0 - Playback controls and file management

• Add pause and resume during playback.
• Add 10-second seek backward and forward during playback.
• Keep volume controls on Up/Down and use Esc to stop playback.
• Show PAUSED in the playback UI and dimmed playback screen.
• Keep wake-first-key behavior for dimmed or black screen playback.
• Add library file rename.
• Add recording lock state with delete protection.
• Add delete confirmation for unlocked recordings.
• Sort recordings by filename descending.
• Add a paged help screen opened with H from the library.

Full Changelog: v1.2.0...v1.3.0