* refactor(storage): extract LocalPathToURL from storage.For
* test(storage): re-enable local storage tests on Windows (#5381)
* test(storage): fix Windows drive-letter path expectation
The 'should handle Windows drive letters correctly' test was gated behind
the now-removed SkipOnWindows BeforeEach, so its expectation had never run.
On Windows, newLocalStorage re-joins u.Host+u.Path via filepath.Join, which
yields a backslash path (C:\music), not C:/music. Assert against
filepath.Join so the expectation matches the OS-native result.
* test(storage): probe Windows drive-letter path in LocalPathToURL
Three review bots flagged that LocalPathToURL escapes the drive-letter
colon (C: -> C%3A), which url.Parse rejects. There are no Windows bug
reports, so add a Windows-gated test that exercises the real conversion
on a drive-letter path and let CI decide whether the bug is real before
changing production code.
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