You're on the host detail page mid-event, lightbox open on a great photo. The byline says "Uploaded by Sarah." You want to see what else Sarah has uploaded — maybe she shot the whole bouquet toss and you want them as a set, or you want to bulk-approve her batch, or send a thank-you note that mentions a specific moment she caught.
Before today, that was a four-step shuffle: close the lightbox, scroll down to the Guest log card, find Sarah in the contributor list, click her row. Then scroll back up to see the filtered grid.
Now the byline itself is the button. Click "Uploaded by Sarah" inside the lightbox and the grid re-renders filtered to her photos — same affordance as clicking her name in the Guest log card, half the steps. The lightbox closes, the filter banner appears with a one-click "Clear filter" link, every other URL param (sort, search, album tab) stays intact.
Guest viewer is intentionally left out of this one. Anonymous visitors don't get the contributor filter — it's a host triage tool, not a guest browsing mode. A guest who wants to see more from one specific friend should ask their friend, not the gallery.
