fix: clamp instant recording output to even minimum size #4395

Job	Run time
Build Desktop (x86_64-pc-windows-msvc, windows-latest)	9m 59s
Build Desktop (aarch64-apple-darwin, macos-latest)	3m 24s
Format (Cargo)	15s
Lint (Biome)	15s
Detect Changes	5s
Typecheck	1m 9s
Format (Biome)	6s
Clippy	58s
Verify Tauri plugin versions	0s
Rust cache	0s
	16m 11s

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