refactor(plugin): preserve Windows filenames in native helpers (#798)

* refactor(plugin): preserve Windows wide paths for typed helpers

* fix(plugin): namespace native Windows filesystem operations

* fix(plugin): preserve Windows path and directory metadata

* fix(native): preserve cached Windows entry types and path normalization

* refactor(native): simplify Windows path and directory handling

* fix(plugin): preserve verbatim roots and simplify native paths

* refactor(plugin): use native recursive Windows directory creation