[Bug]: Uppercase and lowercase are treated as different letters for Cyrillic characters

[realllyrandommann]

Checklist

• I am using an up-to-date version.
• I have read the documentation.
• I have searched existing issues.

TagStudio Version

Alpha v9.5.6

Operating System & Version

Windows 10

Description

When sorting files with Cyrillic names, it first sorts all capital letters, then all small letters.
Example:

Resulting order for Latin letters: a -> A -> B -> b
Resulting order for Cyrillic letters: А -> Б -> а -> б

This also affects the file and tag search: search terms are always case-sensitive, even when written in lowercase.

Expected Behavior

Cyrillic letters are treated the same as Latin letters when sorting by filename.
Lowercase search terms with Cyrillic letters are treated as case-insensitive.

Steps to Reproduce

1. Add files with Cyrillic filenames to the library (different variations of lower- and uppercase).
2. Sort by filename.
3. Search for a file using lowercase.
4. Add a Cyrillic tag beginning with a capital letter.
5. Search for the tag using lowercase.

Logs

No response