feat(ui): add reusable components for FIGMA-based UI system

- Implemented new reusable components including Label, Input, InputOTP, HoverCard, Popover, Pagination, NavigationMenu, Menubar, ScrollArea, Resizable, RadioGroup, and Progress under `docs/06_Frontend/FIGMA/src/app/components/ui/`.
- Enhanced structural organization to improve scalability and maintainability.
- Updated `settings.gradle.kts` to include the new module `frontend:features:nennung-feature`.

Signed-off-by: Stefan Mogeritsch <stefan.mo.co@gmail.com>

frontend/shells/meldestelle-portal/src/commonMain/kotlin/MainApp.kt

@@ -74,6 +74,7 @@ fun MainApp() {
 
         is AppScreen.Dashboard -> DashboardScreen(
           authTokenManager = authTokenManager,
+          onNennungOeffnen = { navigationPort.navigateToScreen(AppScreen.Nennung) },
           onLogout = {
             authTokenManager.clearToken()
             if (currentPlatform() == PlatformType.DESKTOP) {
@@ -145,6 +146,7 @@ fun MainApp() {
           }
         }
 
+        is AppScreen.Nennung -> NennungScreenContent()
         is AppScreen.Profile -> AuthStatusScreen(
           authTokenManager = authTokenManager,
           onNavigateToLogin = {
@@ -412,7 +414,8 @@ private fun FeatureCard(number: String, title: String, body: String) {
 private fun DashboardScreen(
   authTokenManager: AuthTokenManager,
   onLogout: () -> Unit,
-  onCreateTournament: () -> Unit
+  onCreateTournament: () -> Unit,
+  onNennungOeffnen: () -> Unit = {},
 ) {
   val authState by authTokenManager.authState.collectAsState()
   val scrollState = rememberScrollState()
@@ -474,6 +477,15 @@ private fun DashboardScreen(
       if (isDesktop && isAdmin) {
         // DESKTOP VIEW - STEUERUNGSZENTRALE FÜR DEN ADMIN (DICH)
         // Neues Turnier anlegen Button
+        Button(
+          onClick = onNennungOeffnen,
+          modifier = Modifier.fillMaxWidth().height(64.dp)
+        ) {
+          Text(
+            text = "📋  Nennungs-Maske öffnen",
+            style = MaterialTheme.typography.titleMedium
+          )
+        }
         OutlinedButton(
           onClick = onCreateTournament,
           modifier = Modifier.fillMaxWidth().height(64.dp)