🐛(frontend) default noise reduction to disabled for existing users

Prevent React warnings about uncontrolled/controlled components by ensuring
lk-user-choice store initializes with default value when noise reduction
setting is missing from existing localStorage.

src/frontend/src/stores/userChoices.ts

@@ -12,7 +12,10 @@ export type LocalUserChoices = LocalUserChoicesLK & {
 }
 
 function getUserChoicesState(): LocalUserChoices {
-  return loadUserChoices()
+  return {
+    noiseReductionEnabled: false,
+    ...loadUserChoices(),
+  }
 }
 
 export const userChoicesStore = proxy<LocalUserChoices>(getUserChoicesState())