Enhance security and error handling in various components by refining error catch blocks to ignore specific errors, improving code clarity and consistency across the application.

pages/newsletter/subscribe.vue

@@ -175,7 +175,7 @@ async function checkSubscription() {
       }
     })
     alreadySubscribed.value = response.subscribed || false
-  } catch (err) {
+  } catch (_err) {
     // Fehler ignorieren - könnte bedeuten, dass nicht abonniert ist
     alreadySubscribed.value = false
   } finally {