fix(export): keep cancelled GIF exports from leaving a partial file

[yashranaway]

cancelling a gif export, or having it fail, left a broken half-written gif at the path you picked, because the encoder wrote straight to the destination.

new gif exports now go through the same temp file next to the destination that new mp4 exports already use, and only get moved into place once encoding finishes. existing destinations are still written in place, same as mp4. the helper just takes its suffix from the output path now instead of hardcoding mp4. two tests, a cancelled export leaves nothing behind and a finished one lands with frames. the cancel one fails on main.

🤖 Generated with Claude Code

Confidence Score: 5/5

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

Summary

New GIF exports write to a temporary file beside the destination. The completed file moves into place only after encoding and rendering succeed. Existing destinations are still written in place.

• New GIF exports appear at their chosen path only after encoding finishes.

_{Reviews (2) · Last reviewed commit: "fix(export): stop GIF exports when stagi..." · Reviewed by Greptile}

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[yashranaway]

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[yashranaway]

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