fix(project): keep legacy captions that end at the timeline end

[yashranaway]

this is the legacy caption migration case from the verify expectations. loading an older project dropped a caption that ends exactly at the timeline end. the end time got mapped back through the clip math, which after a transition lands a hair under the real end, so it didn't map and the whole caption was thrown away.

now a time that equals the saved timeline end maps straight to the last source endpoint, no tolerance needed, and times past the end are still rejected. the xfail entry is removed and both migration cases pass, including the 1000 random runs.

🤖 Generated with Claude Code

Confidence Score: 5/5

The PR appears safe to merge; no actionable issues were found.

Summary

Keeps legacy captions and words whose end equals the timeline’s rounded end by mapping that time directly to the final clip’s source endpoint.

• Legacy captions ending at the timeline end keep their final words.

_{Reviews (2) · Last reviewed commit: "fix(project): keep legacy captions at th..." · Reviewed by Greptile}

[yashranaway]

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[yashranaway]

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