Add type annotation and logging to catch block per code review

Co-authored-by: whyour <22700758+whyour@users.noreply.github.com>

src/app.ts

@@ -14,8 +14,9 @@ export function rootContainer(container: any) {
       cookieLocaleKey: 'lang',
       localStorageLocaleKey: 'lang',
     }).slice(0, 2);
-  } catch (e) {
+  } catch (e: unknown) {
     // Handle decodeURIComponent errors from malformed cookies
+    console.warn('Failed to determine locale from cookies:', e);
     currentLocale = '';
   }