fix(web): redirect hidden agent thread links

Author: T3 Code Test

apps/web/src/routes/_chat.$environmentId.$threadId.tsx

@@ -14,6 +14,7 @@ import { SidebarInset } from "~/components/ui/sidebar";
 import { useEnvironmentThreadRefs, useThreadShell } from "../state/entities";
 import { useEnvironmentQuery } from "../state/query";
 import { environmentShell } from "../state/shell";
+import { orchestrationEnvironment } from "../state/orchestration";
 
 function ChatThreadRouteView() {
   const navigate = useNavigate();
@@ -39,17 +40,33 @@ function ChatThreadRouteView() {
     }
     return store.hasDraftThreadsInEnvironment(threadRef.environmentId);
   });
+  const shouldResolveHiddenThread =
+    bootstrapComplete && threadRef !== null && serverThreadShell === null && !draftThreadExists;
+  const hiddenThreadProjection = useEnvironmentQuery(
+    shouldResolveHiddenThread
+      ? orchestrationEnvironment.v2.threadProjection({
+          environmentId: threadRef.environmentId,
+          input: { threadId: threadRef.threadId },
+        })
+      : null,
+  );
+  const routeThread = serverThreadShell ?? hiddenThreadProjection.data?.thread ?? null;
+  // Hidden provider child threads are intentionally absent from the compact
+  // shell snapshot. Let the targeted projection lookup settle before
+  // treating a deep link as missing, so the route can redirect to its parent.
+  const routeLookupComplete =
+    routeThread !== null || hiddenThreadProjection.error !== null || draftThreadExists;
   const renderState = resolveThreadRouteRenderState({
-    bootstrapComplete,
-    serverThreadExists: serverThreadShell !== null,
-    serverThreadDeleted: serverThreadShell?.deletedAt != null,
+    bootstrapComplete: bootstrapComplete && routeLookupComplete,
+    serverThreadExists: routeThread !== null,
+    serverThreadDeleted: routeThread?.deletedAt != null,
     draftThreadExists,
   });
   const serverThreadStarted = threadHasStarted(serverThreadShell);
   const environmentHasAnyThreads = environmentHasServerThreads || environmentHasDraftThreads;
   const subagentParentThreadId =
-    serverThreadShell && isOrchestrationV2InternalSubagentThread(serverThreadShell)
-      ? serverThreadShell.lineage.parentThreadId
+    routeThread && isOrchestrationV2InternalSubagentThread(routeThread)
+      ? routeThread.lineage.parentThreadId
       : null;
 
   useEffect(() => {
@@ -63,11 +80,7 @@ function ChatThreadRouteView() {
   }, [bootstrapComplete, environmentHasAnyThreads, navigate, renderState, threadRef]);
 
   useEffect(() => {
-    if (
-      !threadRef ||
-      !serverThreadShell ||
-      !isOrchestrationV2InternalSubagentThread(serverThreadShell)
-    ) {
+    if (!threadRef || !routeThread || !isOrchestrationV2InternalSubagentThread(routeThread)) {
       return;
     }
     if (subagentParentThreadId === null) {
@@ -82,7 +95,7 @@ function ChatThreadRouteView() {
       }),
       replace: true,
     });
-  }, [navigate, serverThreadShell, subagentParentThreadId, threadRef]);
+  }, [navigate, routeThread, subagentParentThreadId, threadRef]);
 
   useEffect(() => {
     if (!threadRef || !serverThreadStarted || !draftThread) {
@@ -94,7 +107,7 @@ function ChatThreadRouteView() {
   if (
     !threadRef ||
     renderState !== "ready" ||
-    (serverThreadShell !== null && isOrchestrationV2InternalSubagentThread(serverThreadShell))
+    (routeThread !== null && isOrchestrationV2InternalSubagentThread(routeThread))
   ) {
     return null;
   }