Refresh the Flutter snapshot: v3 tickets V3-04 through V3-16, plus a fresh installable APK

V3-04 through V3-07, V3-10, V3-16 shipped complete; V3-11/V3-12/V3-14 shipped code-complete pending device/account verification; V3-08/V3-09 deferred behind a new V3-17 (self-hosted OSRM investigation). 316 tests passing, up from 221.

The APK is a fresh release build (debug-signed, no release signing config exists yet) with two build fixes applied: core library desugaring enabled for flutter_local_notifications, and sentry_flutter bumped to 9.27.0 (8.14.2's bundled Kotlin plugin was incompatible with this project's Kotlin 2.4.0 toolchain).

rippr-flutter-src/test/recording_engine_test.dart

@@ -336,6 +336,50 @@ void main() {
           reason: 'the dead time is a real gap and must render as one');
     });
 
+    test('a recording trip found at restart reports an unexpected stop (V3-12)',
+        () async {
+      await engine.start();
+      await ride(5);
+      await engine.dispose();
+
+      String? reportedReason;
+      final revived = RecordingEngine(
+        repository: repo,
+        locationSource: source,
+        clock: () => fakeNow,
+        onUnexpectedStop: (reason) => reportedReason = reason,
+      );
+      addTearDown(revived.dispose);
+
+      fakeNow = 20000;
+      await revived.restoreAfterProcessDeath();
+
+      expect(reportedReason, isNotNull,
+          reason: 'the recording stopped without anyone choosing that -- the exact '
+              'failure V3-12 exists to surface');
+    });
+
+    test('a cleanly-completed trip reports nothing at restart', () async {
+      await engine.start();
+      await ride(5);
+      await engine.stop();
+      await engine.dispose();
+
+      var called = false;
+      final revived = RecordingEngine(
+        repository: repo,
+        locationSource: source,
+        clock: () => fakeNow,
+        onUnexpectedStop: (_) => called = true,
+      );
+      addTearDown(revived.dispose);
+
+      await revived.restoreAfterProcessDeath();
+
+      expect(called, isFalse,
+          reason: 'a rider who pressed Stop is not a crash and must not be reported');
+    });
+
     test('the dead time is never measured as distance', () async {
       // The bug this guards is in the native app: after a crash the open segment is
       // adopted rather than closed, so computeSummary -- the authoritative pass at trip