feat: server discovery, tunnel fallback, and update configs

frontend/test/server_discovery_test.dart

@@ -0,0 +1,53 @@
+import 'dart:convert';
+import 'dart:io';
+import 'package:dio/dio.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:frontend/core/network/api_constants.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+void main() {
+  TestWidgetsFlutterBinding.ensureInitialized();
+
+  setUp(() async {
+    HttpOverrides.global = null;
+    SharedPreferences.setMockInitialValues({});
+  });
+
+  test('ApiConstants.extractErrorMessage cleans FormatException and HTML', () {
+    try {
+      const badBody = '<!DOCTYPE html><html><body>Error</body></html>';
+      jsonDecode(badBody);
+    } catch (e) {
+      final message = ApiConstants.extractErrorMessage(e);
+      expect(message.contains('FormatUnexpected'), isFalse);
+      expect(message.contains('Unexpected character'), isFalse);
+      expect(message, contains('invalid response'));
+    }
+
+    final dioHtmlError = DioException(
+      requestOptions: RequestOptions(path: '/auth/login'),
+      response: Response(
+        requestOptions: RequestOptions(path: '/auth/login'),
+        statusCode: 400,
+        data: '<!DOCTYPE html><html><pre>SyntaxError</pre></html>',
+      ),
+    );
+    expect(
+      ApiConstants.extractErrorMessage(dioHtmlError),
+      'Invalid request. Please check credentials or server URL.',
+    );
+
+    final dio401Error = DioException(
+      requestOptions: RequestOptions(path: '/auth/login'),
+      response: Response(
+        requestOptions: RequestOptions(path: '/auth/login'),
+        statusCode: 401,
+        data: {'message': 'Invalid username or password'},
+      ),
+    );
+    expect(
+      ApiConstants.extractErrorMessage(dio401Error),
+      'Invalid username or password',
+    );
+  });
+}

frontend/test/widget_test.dart

@@ -1,7 +1,7 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_test/flutter_test.dart';
 
-// Use a relative import to reliably find your main.dart file
+import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:frontend/main.dart';
 
 void main() {
@@ -9,16 +9,13 @@ void main() {
     WidgetTester tester,
   ) async {
     // 1. Build our app and trigger a frame.
-    await tester.pumpWidget(const TisRmsApp());
+    await tester.pumpWidget(const ProviderScope(child: TisRmsApp()));
 
     // 2. Verify that our branding text is present on the Splash Screen
-    expect(find.textContaining('TIS RMS'), findsWidgets);
+    expect(find.textContaining('Talisay Integrated School'), findsWidgets);
 
-    // 3. Verify that the loading spinner is present
-    expect(find.byType(CircularProgressIndicator), findsOneWidget);
-
-    // Note: We don't pump the timer here because the test environment
-    // shouldn't wait for the 2.5 second simulated delay. We just want
-    // to ensure the initial widget tree renders without crashing.
+    // Clean up active timers/animations in test harness
+    await tester.pumpWidget(const SizedBox());
+    await tester.pump(const Duration(seconds: 2));
   });
 }