feat: code-first navigation — use resource codes in links and displays

- DashboardPage: show task_code instead of #id, link via code
- TasksPage: navigate to tasks via task_code
- MilestoneDetailPage: navigate to tasks/supports/meetings via codes
- MilestoneDetailPage: display codes in support/meeting tables
- Fix support/meeting state types to any[] for code property access

src/pages/DashboardPage.tsx

@@ -55,13 +55,13 @@ export default function DashboardPage() {
         <h3>Recent Tasks</h3>
         <table>
           <thead>
-            <tr><th>ID</th><th>Title</th><th>Status</th><th>Priority</th><th>Type</th><th>Subtype</th></tr>
+            <tr><th>Code</th><th>Title</th><th>Status</th><th>Priority</th><th>Type</th><th>Subtype</th></tr>
           </thead>
           <tbody>
             {(stats.recent_tasks || []).map((i) => (
               <tr key={i.id}>
-                <td>#{i.id}</td>
-                <td><a href={`/tasks/${i.id}`}>{i.title}</a></td>
+                <td>{i.task_code || `#${i.id}`}</td>
+                <td><a href={`/tasks/${i.task_code || i.id}`}>{i.title}</a></td>
                 <td><span className={`badge status-${i.status}`}>{i.status}</span></td>
                 <td><span className={`badge priority-${i.priority}`}>{i.priority}</span></td>
                 <td>{i.task_type}</td><td>{i.task_subtype || "-"}</td>