Crash: hyprnavi r fails when a client title contains non-UTF8 bytes (ONLYOFFICE + umlaut filename)

[Noah69420]

Bug report: hyprnavi crashes on invalid UTF-8 in hyprctl -j clients output (ONLYOFFICE window title)

Summary

Running hyprnavi r fails with an UTF-8 decoding error when a client window title contains non-UTF-8 bytes.
This is reproducible with ONLYOFFICE when opening a file whose name contains ü (e.g. Brücken).

hyprnavi exits with: Error: invalid utf-8 sequence of 1 bytes from index 2770

Expected behavior

hyprnavi should not crash. Ideally it should:

• handle invalid UTF-8 gracefully (lossy decode / replacement chars), or
• skip/ignore the offending field/client and still work for navigation.

Actual behavior

hyprnavi r fails immediately with an invalid UTF-8 error.

Steps to reproduce

1. Start Hyprland
2. Open ONLYOFFICE
3. Open a file with a name containing an umlaut, e.g. 2-1-Brücken.pptx
4. Run:

   hyprnavi r

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