swarm ui: the agent card has a terminal icon beside the wanted menu

It opens the agent's terminal tab without opening the card.

frontend/packages/shared/src/icons.tsx

@@ -105,3 +105,24 @@ export function FilterIcon() {
     </svg>
   );
 }
+
+// A prompt in a window (`>_`), the standard "terminal" glyph — the agent
+// card's shortcut to the agent's terminal tab. Same recipe as `LinkIcon`.
+export function TerminalIcon() {
+  return (
+    <svg
+      width="1.3em"
+      height="1.3em"
+      viewBox="0 0 24 24"
+      fill="none"
+      stroke="currentColor"
+      stroke-width="2"
+      stroke-linecap="round"
+      stroke-linejoin="round"
+      aria-hidden="true"
+    >
+      <polyline points="4 17 10 11 4 5" />
+      <line x1="12" y1="19" x2="20" y2="19" />
+    </svg>
+  );
+}