Failed clipboard writes leave `.tmp` files in the sync folder

[offbyonebit]

Severity: medium
Type: robustness
Location: clipsync/clipboard.py — ClipboardSync._write_file() (~line 710), _write_image_file() (~line 790)

Problem: Both methods write to a .tmp sibling and then tmp.replace(path). If the replace fails with a non-PermissionError, or after the retry loop exhausts, the exception propagates and the temporary file is left behind. Syncthing may then sync the partial .tmp file to peers.

Suggested fix: Wrap the replace loop in a try/finally (or context manager) that deletes the temporary file whenever the write does not complete successfully.

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_{Filed from a full-source audit of the repo (2026-07-29). Reported by the audit but not independently confirmed - verify the cited code before acting on it.}