v0.26.0

Added

• Overview page at the start of the app: all vaults you can access with template, number of notes and last change,
  plus the most recently changed notes across them. Player accounts with a single vault still go straight to it. The
  BasaltNotes logo in the sidebar leads here.

Fixed

• Deleting a vault failed when /data/vaults is a separate mount, as in the recommended setup. The folder is now
  copied to data/deleted-vaults in that case, including its history. If copying fails, the vault stays untouched.
• A failed vault deletion now shows an error message instead of doing nothing, and no longer stops the vault's file
  watcher.