fix: restore role-aware settings with hidden utility and sidebar logic

curio/globals.css

@@ -201,3 +201,8 @@ a {
 ::-webkit-scrollbar-thumb:hover {
     background: var(--text-muted);
 }
+
+/* Visibility Utilities */
+.hidden {
+    display: none !important;
+}

curio/settings.html

@@ -156,6 +156,14 @@
                 document.querySelector('.doctor-only').classList.remove('hidden');
                 document.querySelector('.header-title h1').innerText = 'Doctor Preferences';
                 document.querySelector('.header-title p').innerText = 'Manage your profile and clinical tool settings.';
+                
+                // Hide admin sidebar links
+                document.querySelectorAll('.side-nav a').forEach(link => {
+                    const text = link.innerText.toLowerCase();
+                    if (text.includes('billing') || text.includes('staff') || text.includes('overview')) {
+                        link.style.display = 'none';
+                    }
+                });
             }
         });