swarm-ui: try-out rows keyed by position, distinct names, and accurate storage wording

Two classifications sharing a name made the result table's row key collide, so the form now refuses duplicate names and the table keys rows by position anyway. The page said it stores nothing in the browser, but the result table remembers its column filters like every table does; the header comment and the docs now say that. The row cap's comment says to keep it in step with the endpoint's own cap.

frontend/packages/swarm-ui/src/pages/review-tryout/TryOutResult.tsx

@@ -51,7 +51,9 @@ export function TryOutResult({ result }: { result: Result }) {
       <Table
         columns={COLUMNS}
         rows={rows}
-        rowKey={(r) => r.name}
+        // By position: two classifications may share a name, and a shared key
+        // would let one result render over the other.
+        rowKey={(r) => String(rows.indexOf(r))}
         storageKey="swarm-ui:review-tryout:table-filters"
         emptyMessage="the run returned no classifications"
       />