fix(backend): restart idle Pi sessions on resume

backend/src/routes/sessions.ts

@@ -100,10 +100,14 @@ export function sessionRoutes(
   });
   app.post("/sessions/:id/resume", async (req, reply) => {
     const id = (req.params as any).id;
-    if (d.mgr.get(id)) {
-      // Idempotent resume: reattach the browser to the existing Pi runtime.
-      // Do not respawn it (which would discard a pending reviewer widget).
-      return reply.code(200).send({ id, alreadyActive: true });
+    const existing = d.mgr.get(id);
+    if (existing) {
+      const state = existing.bridge.turnState();
+      if (state === "running" || state === "waiting") {
+        return reply.code(200).send({ id, alreadyActive: true });
+      }
+      d.mgr.teardown(id);
+      d.hub.clear(id);
     }
     const manifest = (await d.tht.sessionShow(id, d.getSettings().workspace)) as { status?: string; archived?: boolean } | null;
     if (manifest?.status === "finalized" || manifest?.archived) {