fix(timeline): carry rounded timecode seconds #747

Job	Run time
Rust test (macOS compositor)	1m 46s
Lint	24s
Rust check (Windows compositor)	1m 33s
Validate PR title (semantic)	7s
Build	53s
Type Check	39s
Typecheck (tests)	38s
Docs	9s
Rust test (Linux compositor)	3m 56s
Test	1m 43s
	11m 48s

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