feat(approvals): real work-item queue + active-step actions wired to EA2

New Approvals scene at landing chip + scene route. Pulls live work
items from /api/ea2/work-items?view=all and renders:

- Status counter (running/waiting/blocked)
- Hub filter (chip row, dynamic from response)
- Queue list (display_name + age + active step + hub + requester)
- Selected case detail: active step, dispatch kind, form fields,
  available actions

Clicking an action POSTs to /api/runtime/transactions/<id>/actions/<id>
with the signed-in user as actor and refreshes both the transaction
and the queue. This proves runtime EA2 writes are working end-to-end
beyond just the wizard.

src/App.tsx

@@ -13,6 +13,7 @@ import Agent from "./scenes/Agent";
 import Hub from "./scenes/Hub";
 import GeoAttendance from "./scenes/GeoAttendance";
 import Explainer from "./scenes/Explainer";
+import Approvals from "./scenes/Approvals";
 import CommandBar from "./components/CommandBar";
 import Toaster from "./components/Toaster";
 import Console from "./components/Console";
@@ -167,6 +168,7 @@ export default function App() {
         {scene === "hub-it" && <Hub hub="it" />}
         {scene === "geo-attendance" && <GeoAttendance />}
         {scene === "explainer" && <Explainer />}
+        {scene === "approvals" && <Approvals />}
         {scene === "settings" && <Settings />}
       </div>