refactor: Update Checkbox fill color handling and enhance agreement toggle interaction

lib/view/auth/login_screen.dart

@@ -123,7 +123,17 @@ class _LoginScreenState extends State<LoginScreen> with UIMixin {
                                     shape: RoundedRectangleBorder(
                                       borderRadius: BorderRadius.circular(4),
                                     ),
-                                    fillColor: WidgetStatePropertyAll(contentTheme.secondary),
+                                    fillColor: MaterialStateProperty
+                                        .resolveWith<Color>(
+                                      (Set<WidgetState> states) {
+                                        if (states
+                                            .contains(WidgetState.selected)) {
+                                          return Colors.blueAccent;
+                                        }
+                                        return Colors
+                                            .white; 
+                                      },
+                                    ),
                                     checkColor: contentTheme.onPrimary,
                                     visualDensity: getCompactDensity,
                                     materialTapTargetSize:

lib/view/auth/request_demo_bottom_sheet.dart

@@ -147,22 +147,29 @@ class _OrganizationFormState extends State<_OrganizationForm> {
                 'Please select industry',
               ),
               const SizedBox(height: 10),
-              Row(
+              GestureDetector(
+  onTap: () => setState(() => _agreed = !_agreed),
+  child: Row(
     children: [
       Checkbox(
         value: _agreed,
         onChanged: (val) => setState(() => _agreed = val ?? false),
-                    fillColor: MaterialStateProperty.all(Colors.white),
+        fillColor: MaterialStateProperty.resolveWith((states) {
+          if (states.contains(MaterialState.selected)) {
+            return Colors.blueAccent;
+          }
+          return Colors.white; 
+        }),
         checkColor: Colors.white,
-                    side: MaterialStateBorderSide.resolveWith(
+        side: const BorderSide(color: Colors.blueAccent, width: 2),
-                      (states) =>
-                          BorderSide(color: Colors.blueAccent, width: 2),
-                    ),
       ),
       const Expanded(
-                      child: Text('I agree to privacy policy & terms')),
+        child: Text('I agree to privacy policy & terms'),
+      ),
     ],
   ),
+),
+
               const SizedBox(height: 10),
               ElevatedButton(
                 style: ElevatedButton.styleFrom(