Task: Reduce the Feedback Submission Limit Post Beta

### Task
After beta is completed, reduce the feedback submission limit from 40 to 10 per hour. Display this error state when the limit is reached:

"Thanks for your feedback! You've reached the submission limit for now, please try again in an hour."

Start by locating the feedback submission handling and the existing limit-reached error state in the website. Confirm how the current hourly limit is enforced, then update the post-beta limit and displayed message; done means submissions are limited to 10 per hour and the specified message appears when the limit is reached.

Written by the indexing model from the issue text.