Add real-time filters, Vercel auto-detection, and fix prompt extraction

1. shots still don't identify the submitter in the frontend. 2. shots should also show when they were submitted. 3. let's change the gallery search & filters to be real-time upon selection instead of requiring the user to click Filter. 4. the detected prompt is wrong. it seems to show the whole convo including a bunch of text generated by the AI, instead of the user's actual prompt. 5. linking to the before and after commits is nice but remember I really want to link to the live usable app before and after, I guess by grabbing the links to 'Visit' the corresponding Vercel deployment. 6. i can see now that sometimes a single prompt may trigger the AI to do a lot of work that includes multiple commits, so we can't assume that the relevant 'before' is the immediate prior one on GitHub, instead we need to find the one immediately before the relevant user prompt, which may be multiple commits in the past.