v0.1.1

v0.1.1 — defaults, pinup, keychain UX

- Default provider/tier flipped to google + fast (cheaper +
  quicker; bump to --model pro for finals).
- New pinup preset (mid-century American calendar pinup).
- macOS keychain: items saved with -A so future reads stop
  triggering the "Allow security to access this item?" dialog
  on top of the keychain-unlock prompt. Re-save once after
  upgrading to apply.
- Stops emitting the google-genai "Both GOOGLE_API_KEY and
  GEMINI_API_KEY are set" warning when the user's shell has
  GOOGLE_API_KEY exported.
- Updated app icon.