Continue with server-side validation of user inputs for

I completed this for several types of user inputs today: text for tweets (max length for tweet), time of tweet (hh:mm), tweet id.

I also serve a prompt when validation is failed: e.g. "tweet_text must be under 250 characters" and tinkered with the UX for this as I wanted it to appear alongside the modal where the user filled the form while also keeping the text they input to save them having to type it out again in full.