feat: split authentication related fields into seperate files

lib/screens/common_widgets/auth/basic_auth_fields.dart

@@ -0,0 +1,84 @@
+import 'package:flutter/material.dart';
+import 'package:apidash_core/apidash_core.dart';
+
+class BasicAuthFields extends StatelessWidget {
+  final AuthModel? authData;
+  final Function(AuthModel?) updateAuth;
+
+  const BasicAuthFields({
+    super.key,
+    required this.authData,
+    required this.updateAuth,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    final usernameController = TextEditingController(
+      text: authData?.basic?.username ?? '',
+    );
+    final passwordController = TextEditingController(
+      text: authData?.basic?.password ?? '',
+    );
+
+    return Column(
+      crossAxisAlignment: CrossAxisAlignment.start,
+      children: [
+        Text(
+          "Username",
+          style: TextStyle(fontWeight: FontWeight.bold),
+        ),
+        const SizedBox(height: 4),
+        TextField(
+          controller: usernameController,
+          decoration: _inputDecoration(context, "Username"),
+          onChanged: (_) => _updateBasicAuth(
+            usernameController,
+            passwordController,
+          ),
+        ),
+        const SizedBox(height: 16),
+        Text(
+          "Password",
+          style: TextStyle(fontWeight: FontWeight.bold),
+        ),
+        const SizedBox(height: 4),
+        TextField(
+          controller: passwordController,
+          decoration: _inputDecoration(context, "Password"),
+          obscureText: true,
+          onChanged: (_) => _updateBasicAuth(
+            usernameController,
+            passwordController,
+          ),
+        ),
+      ],
+    );
+  }
+
+  InputDecoration _inputDecoration(BuildContext context, String hint) {
+    return InputDecoration(
+      constraints: BoxConstraints(
+        maxWidth: MediaQuery.sizeOf(context).width - 100,
+      ),
+      contentPadding: const EdgeInsets.all(18),
+      hintText: hint,
+      hintStyle: Theme.of(context).textTheme.bodyMedium,
+      border: OutlineInputBorder(borderRadius: BorderRadius.circular(8)),
+    );
+  }
+
+  void _updateBasicAuth(
+    TextEditingController usernameController,
+    TextEditingController passwordController,
+  ) {
+    updateAuth(
+      authData?.copyWith(
+        type: APIAuthType.basic,
+        basic: AuthBasicAuthModel(
+          username: usernameController.text.trim(),
+          password: passwordController.text.trim(),
+        ),
+      ),
+    );
+  }
+}