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fix(linux): write fragmented MP4 so a killed helper keeps its take #2526

Job	Run time
Type Check	40s
Build	1m 3s
Typecheck (tests)	53s
Rust test (Linux compositor)	5m 10s
Docs	10s
AppStream metadata	15s
Validate PR title (semantic)	4s
Lint	23s
Rust check (Windows compositor)	3m 1s
Rust test (macOS compositor)	3m 0s
Test	2m 2s
Swift test (macOS capture helper)	1m 4s
	17m 45s