Brings Agendula's screen transitions and settings in line with Calendula. **Motion** - Screens slide in on the M3 Expressive spring and leave through floret's `predictiveBackExit`, everywhere: main navigation and every settings sub-screen. - Settings sub-screens get Calendula's back-swipe preview (shrink, edge shift, rounded corners). The central settings BackHandler is gone; each screen handles its own back. - Main navigation keeps NavHost's own predictive back, which seeks the new exit over the previous screen. - `enableOnBackInvokedCallback` is set, so Android 14/15 show the preview too. **Settings** - Reminders → Notifications, Task form → New task form, with Calendula's subtitles and labels inside Notifications. - Export and import move out of Storage into a new Backup & restore section; Storage keeps only the task store. - The language row uses floret-kit's `LanguagePickerRow` with the translate header. **Deviations from the issue** - The main-navigation swipe preview scales and fades but doesn't shift or round its corners like Calendula's. Matching that exactly would mean replacing navigation-compose with Calendula-style overlays. Settings match exactly. - The AOSP/GrapheneOS Settings transition suggested in the issue isn't adopted; the family stays on its M3 Expressive motion. - Renamed labels keep their string keys, so existing translations stay until Weblate re-reviews them rather than falling back to English. Depends on jlmakiola/floret-kit#17 (the submodule points at it). Closes #66 Co-authored-by: Jean-Luc Makiola <business@jeanlucmakiola.de> Reviewed-on: https://codeberg.org/jlmakiola/agendula/pulls/69