feat(editor): auto-expand timeline height on track addition #6319

Job	Run time
Typecheck	1m 39s
Detect Changes	6s
Format (Biome)	8s
Format (Cargo)	10s
Lint (Biome)	15s
Rust cache (aarch64-apple-darwin, macos-latest)	1m 52s
Rust cache (x86_64-apple-darwin, macos-latest)	1m 53s
Rust cache (x86_64-pc-windows-msvc, windows-latest)	1m 42s
Clippy	0s
Verify Tauri plugin versions	0s
Build Desktop	0s
	7m 45s

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