Missing / wrong gap sprite image path

While looking at the logs for this issue: https://github.com/07th-mod/umineko-question/issues/174

I noticed this on the error log:

` *** can't find file [big\bmp\zoom\gap_akuwaraiA4az20.png.png] ***`

I don't think this is actually related to the crash, since that animation only involves nanjo and not gap.

Most likely we've included `.png` in some path when we're not meant to, resulting in the double `.png` extension.

Look for references to the file path 'big\bmp\zoom\gap_akuwaraiA4az20.png.png' in the codebase, likely in asset loading or animation configuration files. Check for string concatenation or path building logic that might incorrectly append '.png' twice. Verify the fix by running the game or relevant tests to ensure the error log no longer appears.

Written by the indexing model from the issue text.