Harden geofence automation and home editing

test/home_connection_change_test.dart

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+import 'package:flutter_test/flutter_test.dart';
+import 'package:ignis_app/features/homes/services/home_connection_change.dart';
+import 'package:ignis_app/models/home_config.dart';
+
+void main() {
+  test('new home always requires connection validation', () {
+    expect(
+      hasHomeConnectionChanges(
+        originalHome: null,
+        normalizedUrl: 'https://ignis.akokos.ru',
+        apiKey: 'secret-key',
+        originalApiKey: '',
+      ),
+      isTrue,
+    );
+  });
+
+  test('local-only home edits do not require connection validation', () {
+    final originalHome = HomeConfig(
+      id: 'home-1',
+      name: 'Квартира',
+      url: 'https://ignis.akokos.ru',
+      latitude: 55.75,
+      longitude: 37.61,
+    );
+
+    expect(
+      hasHomeConnectionChanges(
+        originalHome: originalHome,
+        normalizedUrl: originalHome.url,
+        apiKey: 'saved-key',
+        originalApiKey: 'saved-key',
+      ),
+      isFalse,
+    );
+  });
+
+  test('url or api key changes still require connection validation', () {
+    final originalHome = HomeConfig(
+      id: 'home-1',
+      name: 'Квартира',
+      url: 'https://ignis.akokos.ru',
+    );
+
+    expect(
+      hasHomeConnectionChanges(
+        originalHome: originalHome,
+        normalizedUrl: 'https://new.ignis.akokos.ru',
+        apiKey: 'saved-key',
+        originalApiKey: 'saved-key',
+      ),
+      isTrue,
+    );
+    expect(
+      hasHomeConnectionChanges(
+        originalHome: originalHome,
+        normalizedUrl: originalHome.url,
+        apiKey: 'new-key',
+        originalApiKey: 'saved-key',
+      ),
+      isTrue,
+    );
+  });
+}