* fix(persistence): add nil guards to cursor wrapping in folder and mediafile repos
Prevent SIGSEGV panic when queryWithStableResults yields a zero-value
struct on the rows.Err() path (e.g., "database is locked" during
concurrent scanning). Extract cursor wrapping into wrapFolderCursor and
wrapMediaFileCursor with nil checks matching the existing pattern in
album_repository.go.
Fixes#5138
* fix(persistence): wrap original cursor error in nil guard messages
Use %w to preserve the underlying error (e.g., "database is locked")
so callers can use errors.Is/As for root cause analysis. Tests now
verify the original error is accessible via errors.Is.
* fix(persistence): add nil guards and error wrapping in album, folder, and mediafile cursor functions
Signed-off-by: Deluan <deluan@navidrome.org>
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Signed-off-by: Deluan <deluan@navidrome.org>
Deluan Quintão
ed4c0ef432