Commit 5b4c29b123 made SanitizePath rebuild paths from split components after resolving traversal. That reconstruction retained only one leading separator, collapsing UNC paths and breaking network-backed directories.
Parse the path root separately from normal components. Preserve UNC prefixes, drive-absolute and drive-relative forms, and extended UNC/device namespaces while normalizing separators and dot components.
Treat the UNC server/share portion as part of the root so parent traversal cannot escape into another share. Also preserve root-only results such as / and C:\\ instead of stripping their final separator.
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- [x] I have read and followed the [AI Policy](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/docs/policies/AI.md)
- [x] I have read and followed the [Coding Guidelines](https://git.eden-emu.dev/eden-emu/eden/src/branch/master/docs/policies/Coding.md) to the best of my ability.
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Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/4437
Reviewed-by: lizzie <lizzie@eden-emu.dev>
Reviewed-by: CamilleLaVey <camillelavey99@gmail.com>
Feng Chen
c3f1e6562b