1.2.0: localized App Store screenshots (es/de/fr/it/pt-BR) + 1.2.0 release notes

- Caption-localized the 5 iPhone 6.7" + 5 iPad 12.9" screenshots into the 5
  non-English locales, reusing the en-US framed captures (in-frame UI stays EN).
  Tooling in fastlane/screenshot_localize/ (Pillow: repaints the pastel caption
  band, re-renders headline/subtitle in SF Pro; auto-fits + wraps per language).
- Rewrote release_notes 1.2.0 in all 6 languages: since 1.1.5 never shipped
  publicly (last public = 1.1.4), the notes consolidate 1.1.5 + 1.2.0 features.
- Fastfile: new `publish` lane — uploads metadata + screenshots for an existing
  TestFlight build (skip_binary_upload, no submit) so offer codes can be set up
  before submission.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BkanrydYtrme8wipTzWssG

fastlane/README.md

@@ -23,6 +23,14 @@ For _fastlane_ installation instructions, see [Installing _fastlane_](https://do
 
 Push a new beta build to TestFlight
 
+### ios publish
+
+```sh
+[bundle exec] fastlane ios publish
+```
+
+Upload metadata + localized screenshots for an existing TestFlight build (no rebuild, no submit)
+
 ### ios release
 
 ```sh