refactor(frontend): drop unused params, props and api surface

Remove the never-read _revalidate argument of mutateVerge and its 16
call-site placeholders, seven never-passed props of the split chip
editor, the unconsumed refreshDecorated context member, the now-orphaned
toggleFullscreen control, the unused translate argument of the notice
message handler, the reserved-but-unset ServiceConfig.timeout field and
unreachable branches in parseNoticeExtras.

src/components/setting/setting-system.tsx

@@ -29,7 +29,7 @@ const SettingSystem = ({ onError }: Props) => {
     value: boolean,
   ) => value
   const onChangeData = (patch: Partial<IVergeConfig>) => {
-    mutateVerge({ ...verge, ...patch }, false)
+    mutateVerge({ ...verge, ...patch })
   }
 
   return (