### feat: erweitere und optimiere Online-Nennformular

- **Display:** Link zur Nennungs-URL nur für Desktop hinzugefügt.
- **Inputs:** Unterstütze `singleLine` in allen Texteingabefeldern.
- **UX:** Hinzufügen von `ImeAction.Done` für Bemerkungen mit direkter Verarbeitung bei Abschluss.

frontend/features/nennung-feature/src/commonMain/kotlin/at/mocode/frontend/features/nennung/presentation/web/OnlineNennungFormular.kt

@@ -213,6 +213,16 @@ fun OnlineNennungFormular(
             fontWeight = FontWeight.ExtraBold,
             color = AppColors.Primary
           )
+
+          if (!isMobile) {
+            Text(
+              text = "https://nennung.mo-code.at/#/nennung/$turnierNr",
+              style = MaterialTheme.typography.labelMedium,
+              color = AppColors.Primary.copy(alpha = 0.6f),
+              modifier = Modifier.padding(bottom = 4.dp)
+            )
+          }
+
           Text(
             text = "Turnier-Nr: $turnierNr | Datum: ${if (turnierNr == "26128") "25. April 2026" else "26. April 2026"}",
             style = MaterialTheme.typography.titleMedium,
@@ -230,6 +240,7 @@ fun OnlineNennungFormular(
               label = { Text("Vorname*") },
               modifier = Modifier.fillMaxWidth(),
               shape = RoundedCornerShape(12.dp),
+              singleLine = true,
               keyboardOptions = KeyboardOptions(imeAction = ImeAction.Next),
               keyboardActions = KeyboardActions(onNext = { focusManager.moveFocus(FocusDirection.Next) })
             )
@@ -239,6 +250,7 @@ fun OnlineNennungFormular(
               label = { Text("Nachname*") },
               modifier = Modifier.fillMaxWidth(),
               shape = RoundedCornerShape(12.dp),
+              singleLine = true,
               keyboardOptions = KeyboardOptions(imeAction = ImeAction.Next),
               keyboardActions = KeyboardActions(onNext = { focusManager.moveFocus(FocusDirection.Next) })
             )
@@ -250,6 +262,7 @@ fun OnlineNennungFormular(
                 label = { Text("Vorname*") },
                 modifier = Modifier.weight(1f),
                 shape = RoundedCornerShape(12.dp),
+                singleLine = true,
                 keyboardOptions = KeyboardOptions(imeAction = ImeAction.Next),
                 keyboardActions = KeyboardActions(onNext = { focusManager.moveFocus(FocusDirection.Next) })
               )
@@ -259,6 +272,7 @@ fun OnlineNennungFormular(
                 label = { Text("Nachname*") },
                 modifier = Modifier.weight(1f),
                 shape = RoundedCornerShape(12.dp),
+                singleLine = true,
                 keyboardOptions = KeyboardOptions(imeAction = ImeAction.Next),
                 keyboardActions = KeyboardActions(onNext = { focusManager.moveFocus(FocusDirection.Next) })
               )
@@ -272,6 +286,7 @@ fun OnlineNennungFormular(
             isError = email.isNotEmpty() && !isEmailValid,
             modifier = Modifier.fillMaxWidth(),
             shape = RoundedCornerShape(12.dp),
+            singleLine = true,
             keyboardOptions = KeyboardOptions(keyboardType = KeyboardType.Email, imeAction = ImeAction.Next),
             keyboardActions = KeyboardActions(onNext = { focusManager.moveFocus(FocusDirection.Next) })
           )
@@ -282,6 +297,7 @@ fun OnlineNennungFormular(
             label = { Text("Telefon-Nr.") },
             modifier = Modifier.fillMaxWidth(),
             shape = RoundedCornerShape(12.dp),
+            singleLine = true,
             keyboardOptions = KeyboardOptions(keyboardType = KeyboardType.Phone, imeAction = ImeAction.Next),
             keyboardActions = KeyboardActions(onNext = { focusManager.moveFocus(FocusDirection.Next) })
           )
@@ -294,8 +310,9 @@ fun OnlineNennungFormular(
             label = { Text("Pferdename / Kopfnummer*") },
             modifier = Modifier.fillMaxWidth(),
             shape = RoundedCornerShape(12.dp),
+            singleLine = true,
             keyboardOptions = KeyboardOptions(imeAction = ImeAction.Next),
-            keyboardActions = KeyboardActions(onNext = { focusManager.moveFocus(FocusDirection.Down) })
+            keyboardActions = KeyboardActions(onNext = { focusManager.moveFocus(FocusDirection.Next) })
           )
 
           Spacer(Modifier.height(8.dp))
@@ -370,7 +387,24 @@ fun OnlineNennungFormular(
             placeholder = { Text("z.B. Startzeit-Wünsche, Stallnachbarn...") },
             modifier = Modifier.fillMaxWidth(),
             minLines = 3,
-            shape = RoundedCornerShape(12.dp)
+            shape = RoundedCornerShape(12.dp),
+            keyboardOptions = KeyboardOptions(imeAction = ImeAction.Done),
+            keyboardActions = KeyboardActions(onDone = {
+              if (canSubmit) {
+                val payload = NennungPayload(
+                  vorname = vorname,
+                  nachname = nachname,
+                  lizenz = "N/A",
+                  pferdName = pferdName,
+                  pferdAlter = "N/A",
+                  email = email,
+                  telefon = telefon,
+                  bewerbe = ausgewaehlteBewerbe.toList(),
+                  bemerkungen = bemerkungen
+                )
+                onNennenAbgeschickt(payload)
+              }
+            })
           )
 
           Spacer(Modifier.height(24.dp))