style: apply prettier across the tree

One-shot prettier pass so the new format:check gate starts from a clean
baseline. Formatting only — no behaviour change. Generator-owned and
vendored artifacts stay untouched via .prettierignore.

src/app/api/settings/telegram/test/route.ts

@@ -9,8 +9,14 @@ import { defaultLocale, type Locale } from "@/lib/i18n/config";
 import { getServerTranslator } from "@/lib/i18n/server-translator";
 
 function isLocale(value: string | null | undefined): value is Locale {
-  return value === "de" || value === "en" || value === "fr" ||
-    value === "es" || value === "it" || value === "pl";
+  return (
+    value === "de" ||
+    value === "en" ||
+    value === "fr" ||
+    value === "es" ||
+    value === "it" ||
+    value === "pl"
+  );
 }
 
 /**