fix(web): match sanitized schedule validation messages

Keep weekday-specific window errors visible after applying the shared sanitizer.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Copilot-Session: 3a586f29-42a9-436f-8ec3-e84b097c8a3b

Author: AchoArnold

web/app/pages/settings/index.vue

@@ -643,9 +643,9 @@ function scheduleWindowError(index: number): string | null {
     ? errorMessages.value.get('windows')
     : []
   if (messages.length === 0) return null
-  const message = messages.find((x) => x.includes(`day_of_week ${index}`))
+  const message = messages.find((x) => x.includes(`Day of week ${index}`))
   return message
-    ? message.replace(`day_of_week ${index}`, getWeekday(index))
+    ? message.replace(`Day of week ${index}`, getWeekday(index))
     : null
 }