V3-12: crash reporting (code only)

shouldInitializeCrashReporting() and scrubExtra() are pure, fully unit-tested decision/scrubbing functions wired into sentry_flutter via beforeSend/beforeBreadcrumb. Config.crashReportingEnabled defaults off; the DSN is a compile-time --dart-define, not a preference. RecordingEngine gained an injected onUnexpectedStop callback, firing once when restoreAfterProcessDeath finds a trip still 'recording' at launch -- the process died without a user stop.

Marked partially done: the ticket's real acceptance criteria (a forced crash landing in a real Sentry project from a release build, inspecting a real payload) need a Sentry account and a release build this environment can't produce.

test/settings_screen_test.dart

@@ -90,10 +90,36 @@ void main() {
     expect(config.mountedMode, isTrue);
   });
 
+  testWidgets('the crash reporting switch writes through to Config (V3-12)',
+      (tester) async {
+    await tester.pumpWidget(host());
+    await tester.pumpAndSettle();
+
+    final initial = tester
+        .widget<SwitchListTile>(find.byKey(const Key('crash-reporting-switch')))
+        .value;
+    expect(initial, isFalse, reason: 'off until a privacy policy exists');
+
+    await tester.tap(find.byKey(const Key('crash-reporting-switch')));
+    await tester.pumpAndSettle();
+
+    expect(config.crashReportingEnabled, isTrue);
+  });
+
+  /// The Sync section has been pushed below the default test viewport by every section
+  /// added above it since this suite was first written (V3-05, then V3-12) -- a
+  /// `ListView` does not mount elements outside its viewport/cache extent, so `find`
+  /// cannot see them until scrolled into view.
+  Future<void> scrollToSync(WidgetTester tester) async {
+    await tester.drag(find.byType(ListView).first, const Offset(0, -600));
+    await tester.pumpAndSettle();
+  }
+
   group('upload endpoint', () {
     testWidgets('a valid https URL is saved', (tester) async {
       await tester.pumpWidget(host());
       await tester.pumpAndSettle();
+      await scrollToSync(tester);
 
       await tester.enterText(
         find.byKey(const Key('endpoint-field')),
@@ -110,6 +136,7 @@ void main() {
         'silently stored', (tester) async {
       await tester.pumpWidget(host());
       await tester.pumpAndSettle();
+      await scrollToSync(tester);
 
       await tester.enterText(
         find.byKey(const Key('endpoint-field')),
@@ -126,6 +153,7 @@ void main() {
     testWidgets('a non-http scheme is rejected', (tester) async {
       await tester.pumpWidget(host());
       await tester.pumpAndSettle();
+      await scrollToSync(tester);
 
       await tester.enterText(
         find.byKey(const Key('endpoint-field')),
@@ -142,6 +170,7 @@ void main() {
       await config.setUploadEndpoint('https://example.test/ingest');
       await tester.pumpWidget(host());
       await tester.pumpAndSettle();
+      await scrollToSync(tester);
 
       await tester.enterText(find.byKey(const Key('endpoint-field')), '');
       await tester.tap(find.byKey(const Key('save-endpoint')));
@@ -156,13 +185,11 @@ void main() {
     await tester.pumpWidget(host());
     await tester.pumpAndSettle();
 
+    await scrollToSync(tester);
+
     expect(find.text(config.deviceId), findsOneWidget);
     expect(find.byKey(const Key('copy-device-id')), findsOneWidget);
 
-    // The list has grown past one screen (V3-05 added a section above this), so the
-    // control is not necessarily within the default test viewport.
-    await tester.drag(find.byType(ListView).first, const Offset(0, -400));
-    await tester.pumpAndSettle();
     // Tapping must not throw even though no real clipboard exists in the test harness.
     await tester.tap(find.byKey(const Key('copy-device-id')));
     await tester.pumpAndSettle();