Eunchurn Park 93226c9fbb Fix file browser navigation for non-ASCII folder names (#178) ...

## Summary

* **What is the goal of this PR?**

Fix file browser failing to navigate into subdirectories with non-ASCII
(Korean/Unicode) folder names.

* **What changes are included?**

- Enable UTF-8 long file names in SdFat (`USE_UTF8_LONG_NAMES=1`)
- Add directory validation before iterating files
- Add `rewindDirectory()` call for stability

## Additional Context

2025-12-31 09:08:31 +11:00

1.6 KiB

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