Camera Only Mode, Faster macOS Capture & Better Screenshot UX - Cap

Camera Only Mode — Record video using just your camera. This mode can be toggled directly from the main window for quick, focused video capture. Both Studio and Instant Mode supported.
More reliable decoding and seek behavior — Added FFmpeg software fallback when hardware decoding fails, improved AVAssetReader end-of-file handling, and tuned decoder timeouts for slow seeks and initial playback.
Smoother exports and playback stability — Editor preview now pauses during export, keyframe distribution and frame iteration were improved, and GPU buffer resizing is more robust to reduce stalls.
Lower-overhead macOS frame processing — Introduced pooled pixel buffers and a dedicated copier for screen capture, then refactored frame scaling around the pool for more efficient processing.
Improved audio timestamp and drift handling — Reworked timestamp/drift logic in the recording and MP4 pipelines for more stable long-running audio-video sync.
Cleaner screenshot workflow — Target selection overlays are now hidden before capture, hidden overlays no longer block clicks, and screenshot notification audio behavior was refined.
Better multi-display overlay focus — Improved focus and positioning logic for target-selection overlays across multi-monitor setups.