feat: add task type hierarchy with subtypes in UI

src/pages/DashboardPage.tsx

@@ -55,7 +55,7 @@ export default function DashboardPage() {
         <h3>Recent Issues</h3>
         <table>
           <thead>
-            <tr><th>ID</th><th>Title</th><th>Status</th><th>Priority</th><th>Type</th></tr>
+            <tr><th>ID</th><th>Title</th><th>Status</th><th>Priority</th><th>Type</th><th>Subtype</th></tr>
           </thead>
           <tbody>
             {(stats.recent_issues || []).map((i) => (
@@ -64,7 +64,7 @@ export default function DashboardPage() {
                 <td><a href={`/issues/${i.id}`}>{i.title}</a></td>
                 <td><span className={`badge status-${i.status}`}>{i.status}</span></td>
                 <td><span className={`badge priority-${i.priority}`}>{i.priority}</span></td>
-                <td>{i.issue_type}</td>
+                <td>{i.issue_type}</td><td>{i.issue_subtype || "-"}</td>
               </tr>
             ))}
           </tbody>