Crop clips in the editor and export the region

[mintycw]

Closes #220.

Ultrawide recordings used to go to ganked.tv whole and get cropped there. The editor now has a crop rectangle over the preview, and Save, Save as copy and Upload write only that region.

What's in it

• crop.rs: the pure crop math (normalized rect, presets Original / 16:9 / 21:9 / 4:3 / 9:16 / Free, ratio-locked resize with anchored edges, even-pixel snapping for yuv420p), ported from ganked.tv's cropper with its test suite.
• cropbox.rs: the overlay widget stacked over the preview and the fullscreen view. Eight handles, body drag, arrows move, shift+arrows resize, esc resets. It draws over the same contain rect the video shader uses, so the detail-page still switched from Cover to Contain.
• export.rs: the one re-encode path in the app, through the bundled ffmpeg: trim and crop in one pass, libx264 at CRF 18 / veryfast, audio copied, progress on stdout, cancellable. Trim-only stays the lossless stream copy.
• Library wiring: preset pills and an output-size readout under the preview, TRIM & CROP panel with progress and Cancel, upload crops locally first. The rectangle is editor state like the trim range, not persisted.
• macOS bundles no ffmpeg, so the crop controls show a "needs ffmpeg" state, re-probed on each clip open until one is found.
• ADR 0025 records why cropping lives at export and not at record time (ADR 0019 still holds for recording).
• Also clears the chunks_exact lints the current stable clippy raises, so CI stays green when it moves.

Verified

• cargo test --workspace, cargo clippy --workspace --all-targets -- -D warnings, rustfmt --check over every crate: green.
• The ffmpeg-gated #[ignore] tests (real export of a synthesised clip, read back through our MP4 reader and the openh264 thumbnail path; upload crop temp) pass against ffmpeg 9.
• Not yet checked by eye: the overlay on a real ultrawide clip in the running app, the Overwrite round-trip in the GUI, and the pill row at the narrowest window width. Worth a look on the Linux box before merging.

[coderabbitai]

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