dashboard: mark the fallback model '(default)' instead of 'default->'

'default->14b' read like a mapping from a tier named 'default'; a trailing
'14b (default)' clearly labels it as the fallback for unmapped tiers.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: garthvh

dashboard.html

@@ -323,10 +323,10 @@ <h3>Response <button class="copy" data-copy="d-resp">copy</button></h3>
       } else if (keys.length) {
         $("routing-chip").firstChild.textContent = "routing ";
         $("model").textContent =
-          keys.map((k) => `${tier(k)}→${map[k]}`).join(" · ") + ` · default→${dm}`;
+          keys.map((k) => `${tier(k)}→${map[k]}`).join(" · ") + ` · ${dm} (default)`;
       } else {
         $("routing-chip").firstChild.textContent = "model ";
-        $("model").textContent = dm;
+        $("model").textContent = `${dm} (default)`;
       }
       render();
     } else if (msg.type === "update") {