Two names that differ only in case are one file on Windows and on macOS as they
come, and Win32 drops a trailing dot or space, so `clip.png` with `CLIP.png`,
and `a.png` with `a.png.`, still landed on each other: ten entries extracted to
nine files on APFS, one footage item holding the other's picture. Collisions are
now looked up by a key with the case folded and those characters off the end,
while the name written stays as the entry asked.
Found by CodeRabbit on the pull request.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
