feature: a minimal implementation of the appointment feature done.

frontend/src/shared/permissions.ts

@@ -48,3 +48,35 @@ export function canViewStaff(org: Organization | null): boolean {
     hasPermission(org, 'TAB_STAFF_READ') || hasPermission(org, 'TAB_STAFF_EDIT')
   );
 }
+
+/**
+ * Create/delete/book slots: owners, appointment editors, or treatment editors (schedule columns).
+ * Aligns with backend appointment mutations.
+ */
+export function canEditAppointments(org: Organization | null): boolean {
+  if (!org) {
+    return false;
+  }
+  if (org.isOwner) {
+    return true;
+  }
+  return (
+    hasPermission(org, 'TAB_APPOINTMENTS_EDIT') ||
+    hasPermission(org, 'TAB_TREATMENT_EDIT')
+  );
+}
+
+/** Route + sidebar: view appointments page if user can read appointments or manage treatment (column staff). */
+export function canAccessAppointmentsSection(org: Organization | null): boolean {
+  if (!org) {
+    return false;
+  }
+  if (org.isOwner) {
+    return true;
+  }
+  return (
+    hasPermission(org, 'TAB_APPOINTMENTS_READ') ||
+    hasPermission(org, 'TAB_APPOINTMENTS_EDIT') ||
+    hasPermission(org, 'TAB_TREATMENT_EDIT')
+  );
+}