feat(ui): add "See All" link to agent detail Recent Issues section

Remove the issue count from the Recent Issues heading and add a
"See All →" link that navigates to /issues?assignee={agentId}.
The Issues page now reads the assignee query param and pre-filters
the list to show that agent's issues.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

ui/src/pages/AgentDetail.tsx

@@ -708,7 +708,12 @@ function AgentOverview({
 
       {/* Recent Issues */}
       <div className="space-y-3">
-        <h3 className="text-sm font-medium">Recent Issues ({assignedIssues.length})</h3>
+        <div className="flex items-center justify-between">
+          <h3 className="text-sm font-medium">Recent Issues</h3>
+          <Link to={`/issues?assignee=${agentId}`} className="text-xs text-muted-foreground hover:text-foreground transition-colors">
+            See All &rarr;
+          </Link>
+        </div>
         {assignedIssues.length === 0 ? (
           <p className="text-sm text-muted-foreground">No assigned issues.</p>
         ) : (