fix(App.vue): update user permissions check and enhance dropdown behavior

- Changed the condition for displaying the click-TT link from admin status to a more specific permission check (canManagePermissions).
- Adjusted dropdown styling to improve usability by setting a maximum height and enabling vertical scrolling while hiding horizontal overflow.

frontend/src/App.vue

@@ -30,7 +30,7 @@
             <span class="dropdown-icon">📋</span>
             {{ $t('navigation.logs') }}
           </router-link>
-          <router-link v-if="isAdmin" to="/clicktt" class="dropdown-item" @click="userDropdownOpen = false">
+          <router-link v-if="canManagePermissions" to="/clicktt" class="dropdown-item" @click="userDropdownOpen = false">
             <span class="dropdown-icon">🌐</span>
             HTTV / click-TT
           </router-link>
@@ -464,7 +464,9 @@ export default {
   border-radius: 8px;
   box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
   min-width: 200px;
-  overflow: hidden;
+  max-height: 70vh;
+  overflow-y: auto;
+  overflow-x: hidden;
   z-index: 10000;
   animation: dropdownFadeIn 0.2s ease;
 }