pub const LIBRARY_METADATA_DIR: &str = ".photovault";Expand description
Per-drive metadata folder. Kept as .photovault for backwards
compatibility with libraries indexed before the Smriti rename —
renaming would orphan every user’s existing thumbnails / db /
face crops on disk. Treat the on-disk folder name as part of the
wire contract; new code reads this constant rather than the
literal so the link to the legacy name stays explicit.