fix(ui): nothing past the right edge of a phone

The Feed's chips + Sort + View row did not fit one line at 375px and pushed
the page 21px wide; the toast stack capped its width by the viewport while
it sits right of the sidebar. The toolbar rows (Feed, Plex browse) wrap,
and the toasts are capped by their host.

frontend/src/components/Feed.tsx

@@ -716,7 +716,9 @@ export default function Feed({
               (overflowing to a "+N"/count pill so they never crowd the controls), while Sort + View stay
               pinned to the right. Channel-scoped feeds show no chips (their baseline isn't a "filter you
               applied"), but still get the right-pinned Sort/View. */}
-          <div className="flex items-center gap-2 pb-2">
+          {/* Wraps on a phone: the chips and Sort + View did not fit one line, and the row pushed the
+              page 21px wide (prod UAT 2026-09-19). Sort + View then take a line of their own. */}
+          <div className="flex flex-wrap items-center gap-2 pb-2">
             {!channelScoped && (
               <>
                 {/* The active personal view (if any) leads the applied-filter row. */}