feat(desktop): add timeline slider to crop modal for frame-accurate cropping #5013

Job	Run time
Format (Cargo)	19s
Format (Biome)	8s
Lint (Biome)	12s
Detect Changes	9s
Typecheck	1m 10s
Clippy (aarch64-apple-darwin, macos-latest)	1m 28s
Rust cache (x86_64-apple-darwin, macos-latest)	3m 20s
Rust cache (aarch64-apple-darwin, macos-latest)	4m 24s
Clippy (x86_64-pc-windows-msvc, windows-latest)	4m 53s
Rust cache (x86_64-pc-windows-msvc, windows-latest)	6m 2s
Build Desktop	0s
Verify Tauri plugin versions	0s
	22m 5s

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