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cb6ee72132
`Paths.delete_thread_dir()` called `shutil.rmtree()` directly. Windows
refuses to unlink a file that carries the read-only attribute
(`WinError 5`) where POSIX only needs a writable parent, so one read-only
file under `user-data/` made the whole thread undeletable: `DELETE
/api/threads/{id}` answered 500 `Failed to delete local thread data`,
`rmtree` had already removed everything it walked before that entry, and
every later retry failed on the same file.
Retry at the call site: clear the read-only attribute tree-wide and call
`rmtree()` once more. Only `PermissionError` is retried, the retry still
raises when it cannot help, so a file another process holds open stays a
real error instead of becoming a silent skip. A `onexc` handler cannot do
this portably: POSIX `_rmtree_safe_fd()` catches the handler's own
`PermissionError`, re-dispatches it as a `scandir` error and leaves the
deletion to fail later as `ENOTEMPTY`.
Co-authored-by: Aling33 <along308@users.noreply.github.com>