Series > Chapter table: Filter by group or title works only with lowercase input

[ericorruption]

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Houdoku version

2.13.0

Operating system

macOS Ventura 13.6

Steps to reproduce

1. Have an extension enabled (e.g. comick)
2. Add a Series to library (e.g. one piece digital colored edition)
3. Navigate to the series details - ideally it has groups or titles with "Title Case" or at least first letter upper case.
4. In the chapter table, try to filter by title or group by using text that you would expect to match a title or group (e.g.: Official to match the "Official" group)

The screenshots below should give more context to understand the steps.

Expected behavior

Actual behavior

Filtering using only lower case text:

Filtering using initial upper case:

Log files

No response

Additional information (optional)

No response