v0.2.3

Text correction portability release. Adds import, export, sharing,
and optional file-based sync for saved text corrections. No migration
steps — brew upgrade --cask parakey or the in-app Update now…
button handles everything.

Text Corrections

• Import and export — save corrections as a .parakey-corrections
  file, then bring them into another Mac with merge or replace.
• Native sharing — share the corrections file from the macOS share
  sheet, including AirDrop when available.
• Optional sync file — point Parakey at a corrections file in
  iCloud Drive, Dropbox, Syncthing, or another synced folder. Parakey
  reads and writes that local file; the folder provider handles
  moving it between Macs.
• Double-click import — .parakey-corrections files are registered
  as Parakey documents and can be opened with the app.

Privacy

• Sync does not add a Parakey account, backend, or new direct network
  call. Correction files are readable JSON so they remain portable and
  auditable.