chore: draw shared code from floret-kit (fresh re-migration onto current main)

Supersedes the stale chore/floret-kit-core-time branch: re-applies the
floret-kit migration on top of current main (122 commits ahead of the old
branch's base), pinning the kit at the multi-value-reminders + pinned-picker HEAD.

- Submodule + composite build (includeBuild), 6 module deps, CI submodules:
  recursive, reproducible-release scan extended to the kit, F-Droid recipe.
- Deletes the inline copies now owned by the kit (GroupedList, Picker scaffolds,
  InlineTextField, OptionCard, DialogControls, CrashReporter + dialog/submit,
  OnboardingScaffold, AppLanguage, TimeBridge, ReorderableColumn, DebugRibbon)
  and redraws them from components/identity/core-crash/core-locale/core-time.
- Reminder overrides drawn from core-reminders (multi-value ReminderOverride +
  codec); Calendula keeps its app-specific bits (all-day resolution, labels,
  presets, the multi-select ReminderDefaultPicker, its own CrashReportActivity).
- Theme draws FloretExpressiveTheme while keeping the user-typography param.

Build pending (deferred): run ./gradlew :app:compileDebugKotlin with ANDROID_HOME
(or floret-kit/local.properties) set.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app/src/main/res/values/strings.xml

@@ -268,6 +268,8 @@
     <!-- Settings (M4) -->
     <string name="settings_title">Settings</string>
     <string name="settings_back">Back</string>
+    <!-- Overrides floret-kit components' CollapsingScaffold back-button label. -->
+    <string name="back">Back</string>
     <string name="settings_section_appearance">Appearance</string>
     <string name="settings_theme">Theme</string>
     <string name="settings_theme_system">System</string>
@@ -497,15 +499,15 @@
 
     <!-- Crash reporting: a captured report the user can submit, by hand, as a
          Gitea issue (the app sends nothing automatically). -->
-    <string name="crash_dialog_title">Calendula crashed</string>
-    <string name="crash_dialog_message">Calendula closed unexpectedly last time. You can help fix it by sending this report as an issue. It stays on your device until you choose to share it, and includes no personal data or calendar content — only the technical details below.</string>
+    <string name="crash_dialog_title">%1$s crashed</string>
+    <string name="crash_dialog_message">%1$s closed unexpectedly last time. You can help fix it by sending this report as an issue. It stays on your device until you choose to share it, and includes no personal data or calendar content — only the technical details below.</string>
     <string name="crash_dialog_report">Report</string>
     <string name="crash_dialog_dismiss">Not now</string>
     <string name="crash_report_issue_title">Crash report</string>
-    <string name="crash_report_clip_label">Calendula crash report</string>
+    <string name="crash_report_clip_label">%1$s crash report</string>
     <string name="crash_report_copied">Report copied to your clipboard</string>
     <string name="crash_report_open_failed">Couldn\'t open the issue tracker. The report is on your clipboard.</string>
-    <string name="crash_report_body_template">Thanks for reporting a crash in Calendula. Please add anything you remember about what you were doing, then submit.\n\n### What happened\n\n\n### Crash report\n%1$s\n</string>
+    <string name="crash_report_body_template">Thanks for reporting a crash in %1$s. Please add anything you remember about what you were doing, then submit.\n\n### What happened\n\n\n### Crash report\n%2$s\n</string>
     <string name="crash_report_body_paste">_(The report was too long for this link — paste it from your clipboard here.)_</string>
     <string name="report_issue_url" translatable="false">https://codeberg.org/jlmakiola/calendula/issues/new</string>
     <string name="report_issue_choose_url" translatable="false">https://codeberg.org/jlmakiola/calendula/issues/new/choose</string>