v0.3.0

Fixed

• Archive configurations created on Windows load: the default config
  wrote the archive path with backslashes, which are escape sequences
  inside a TOML string — every Windows-created config failed to parse.
• The app finds ExifTool when launched from the Finder: a Finder
  launch inherits the system's minimal PATH, so a Homebrew or MacPorts
  install read as missing; the usual install prefixes are probed at
  startup.
• The packaged app no longer risks relaunching itself once per hash
  worker (multiprocessing freeze support in the frozen bundle).
• Closing the window mid-operation stops the work at the library's
  next safe point first, instead of killing it mid-apply and leaving
  the archive lock behind; a dialog offers Stop and close.
• One operation at a time across all views: a second Preview, Apply,
  Undo or Analyze anywhere is refused while one runs, instead of
  fighting over the archive lock after minutes of planning. The
  import source cannot be swapped mid-run, and the verdict banner
  names the source it speaks for.
• Undo and Resume in History show live progress with a Stop button,
  refuse double-clicks before the confirm dialog, and their failures —
  like every failed apply — open a dialog with the full error text
  instead of one truncated status-bar line.
• Stopping a token write no longer claims "a preview changes nothing";
  written tokens are acknowledged and the pending card is replaced,
  not stacked, after a write.
• Settings refuses to save over a config edited on disk since the
  form was loaded — Reload first — instead of silently overwriting
  the external change.
• The History panel's terminal command for undoing teaches the
  archive-scoped journal path; a bare undo --latest reaches across
  every archive on the machine.
• Findings render for report buckets this build has never seen
  (titles and colors fall back), so a newer library cannot crash a
  view mid-paint; the scan-error alarm from stampla 0.5 is rendered
  with its own title and explanation. Requires stampla >= 0.5.