Update app.js

app.js

@@ -35,9 +35,15 @@ async function login() {
     document.getElementById('app-view').classList.remove('d-none');
     document.getElementById('user-role-badge').innerText = `Role: ${state.role}`;
     
+    const btnAdd = document.getElementById('btn-add-new');
+    btnAdd.classList.remove('d-none'); 
+    
     if (state.role === 'User' || state.role === 'Admin') {
-      document.getElementById('btn-add-new').classList.remove('d-none');
+      btnAdd.disabled = false; 
+    } else {
+      btnAdd.disabled = true;  
     }
+    
     await loadInitialData();
   } catch (e) {
     document.getElementById('login-error').classList.remove('d-none');
@@ -48,6 +54,8 @@ function logout() {
   state.user = null; state.password = null; state.role = null;
   document.getElementById('app-view').classList.add('d-none');
   document.getElementById('login-view').classList.remove('d-none');
+  document.getElementById('username').value = '';
+  document.getElementById('password').value = '';
 }
 
 async function loadInitialData() {