Increment 6 — notifications and settings.
- Local new-mail notifications (no push service): MailNotifier posts a notification
when background sync finds newly-arrived unread mail, and tapping it opens the app.
Adds a POST_NOTIFICATIONS request on launch.
- MailSyncer detects genuinely new messages (diff against cached ids, skipped on an
account's first sync) and notifies when the setting is enabled.
- SettingsRepository (Preferences DataStore) persists settings; the Settings screen
gains a Notifications section, and "Use wallpaper colors" now actually drives the
Material You theme (MainActivity collects it reactively).
- assemble/test/lint green; verified on the Android 17 emulator — delivered a new
message and the on-device notification appeared in the shade.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
JMR-devandClaude Opus 4.8
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