* fix: resolve playlist import issues with Unicode character paths
Fixes#3332 where songs with accented characters failed to import from Apple Music M3U playlists. The issue occurred because Apple Music exports use NFC Unicode normalization while macOS filesystem stores paths in NFD normalization.
Added normalizePathForComparison() function that normalizes both filesystem and M3U playlist paths to NFC form before comparison. This ensures consistent path matching regardless of the Unicode normalization form used.
Changes include comprehensive test coverage for Unicode normalization scenarios with both NFC and NFD character representations.
* address comments
Signed-off-by: Deluan <deluan@navidrome.org>
* fix(tests): add check for unequal original Unicode paths in playlist normalization tests
Signed-off-by: Deluan <deluan@navidrome.org>
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Signed-off-by: Deluan <deluan@navidrome.org>
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