Add make/remove admin button in admin dashboard

admin.html

@@ -540,9 +540,20 @@
                     <td class="px-4 py-3 font-medium">${(u.credits || 0).toLocaleString()}</td>
                     <td class="px-4 py-3 text-slate-400 text-sm">${formatDate(u.created_at)}</td>
                     <td class="px-4 py-3">
+                        <div class="flex gap-2">
                             <button onclick="openCreditsModal('${u.id}', '${escapeHtml(u.name || u.email)}', ${u.credits || 0})" class="btn-secondary px-3 py-1 rounded text-sm">
                                 Credits
                             </button>
+                            ${u.role === 'admin' ? `
+                                <button onclick="toggleAdmin('${u.id}', 'user')" class="px-3 py-1 rounded text-sm bg-amber-500/20 text-amber-400 hover:bg-amber-500/30 transition-colors">
+                                    Remove Admin
+                                </button>
+                            ` : `
+                                <button onclick="toggleAdmin('${u.id}', 'admin')" class="px-3 py-1 rounded text-sm bg-purple-500/20 text-purple-400 hover:bg-purple-500/30 transition-colors">
+                                    Make Admin
+                                </button>
+                            `}
+                        </div>
                     </td>
                 </tr>
             `).join('');
@@ -599,6 +610,40 @@
             }
         }
 
+        async function toggleAdmin(userId, newRole) {
+            const user = users.find(u => u.id === userId);
+            const userName = user?.name || user?.email || 'this user';
+            
+            const action = newRole === 'admin' ? 'promote' : 'demote';
+            if (!confirm(`Are you sure you want to ${action} ${userName} to ${newRole}?`)) {
+                return;
+            }
+            
+            const token = await moxieAuth.getToken();
+            
+            try {
+                const response = await fetch(`/api/users/${userId}/role`, {
+                    method: 'PUT',
+                    headers: {
+                        'Authorization': `Bearer ${token}`,
+                        'Content-Type': 'application/json'
+                    },
+                    body: JSON.stringify({ role: newRole })
+                });
+                
+                const data = await response.json();
+                
+                if (data.success) {
+                    await loadUsers();
+                } else {
+                    alert('Failed to update role: ' + data.message);
+                }
+            } catch (error) {
+                console.error('Role update error:', error);
+                alert('Failed to update role');
+            }
+        }
+
         function switchTab(tab) {
             currentTab = tab;