Augani/openreel-video 发布 v0.3.0 - Video Stabilization & Timeline Polish

## Features - **Video stabilization** — FFmpeg vidstab running in-browser via WASM. Tracks camera motion frame-by-frame and corrects it while extending edges (no resolution loss from zooming). User-controlled strength affects analysis precision and smoothing. - **Smooth slow motion** — Optical flow frame interpolation for fluid slow-mo playback - **AI highlight extractor** — Automatically detect key moments in footage - **Text behind subject** — MediaPipe segmentation for text-behind-person effect - **Multi-language transcription** — Subtitle generation with MOV file support - **Noise reduction** — Audio enhancement workflow - **Playhead snap-to-edges** — Playhead gently snaps to clip boundaries when dragging slowly; fast drags pass through unobstructed - **Visible trim handles** — Selected clips show solid handles with grip indicator at both ends - **Preview zoom options** — 50% and 75% zoom-out in preview controls - **Color picker transparency** — Alpha channel support in color pickers - **Command-based editing** — Full undo/redo history system ## Fixes - Smooth timeline scrubbing — RAF-throttled playhead drag with 50ms frame decode debounce - Export includes stabilized video at max quality (`-preset slow -crf 15`) - Only trimmed portion of clips is processed during stabilization - Prevent decoder thrash during timeline scrubbing - Properly isolate audio streams when separating tracks - Fix SVG border artifacts during emphasis animations - Detect multiple audio streams via FFmpeg probe fallback