v0.9.28

Fixed

• Multi-directory scans no longer look stuck between directories. Each directory's os.walk (disk spin-up + tree walk) emitted no progress, freezing the UI on the previous directory's last file — now it shows "Discovering files in <dir>…" at the start of every directory.
• A scan no longer signals completion after each directory. scan_directory emitted a terminal done per directory (not just at the end), prematurely flipping the UI to idle mid-scan; it now emits a non-terminal update, and the single terminal done comes from the worker after all directories finish.