fix(app): file tree not staying in sync across projects/sessions

packages/app/src/context/layout.tsx

@@ -33,6 +33,8 @@ type SessionTabs = {
 type SessionView = {
   scroll: Record<string, SessionScroll>
   reviewOpen?: string[]
+  pendingMessage?: string
+  pendingMessageAt?: number
 }
 
 type TabHandoff = {
@@ -128,6 +130,7 @@ export const { use: useLayout, provider: LayoutProvider } = createSimpleContext(
     )
 
     const MAX_SESSION_KEYS = 50
+    const PENDING_MESSAGE_TTL_MS = 2 * 60 * 1000
     const meta = { active: undefined as string | undefined, pruned: false }
     const used = new Map<string, number>()
 
@@ -555,6 +558,49 @@ export const { use: useLayout, provider: LayoutProvider } = createSimpleContext(
           setStore("mobileSidebar", "opened", (x) => !x)
         },
       },
+      pendingMessage: {
+        set(sessionKey: string, messageID: string) {
+          const at = Date.now()
+          touch(sessionKey)
+          const current = store.sessionView[sessionKey]
+          if (!current) {
+            setStore("sessionView", sessionKey, {
+              scroll: {},
+              pendingMessage: messageID,
+              pendingMessageAt: at,
+            })
+            prune(meta.active ?? sessionKey)
+            return
+          }
+
+          setStore(
+            "sessionView",
+            sessionKey,
+            produce((draft) => {
+              draft.pendingMessage = messageID
+              draft.pendingMessageAt = at
+            }),
+          )
+        },
+        consume(sessionKey: string) {
+          const current = store.sessionView[sessionKey]
+          const message = current?.pendingMessage
+          const at = current?.pendingMessageAt
+          if (!message || !at) return
+
+          setStore(
+            "sessionView",
+            sessionKey,
+            produce((draft) => {
+              delete draft.pendingMessage
+              delete draft.pendingMessageAt
+            }),
+          )
+
+          if (Date.now() - at > PENDING_MESSAGE_TTL_MS) return
+          return message
+        },
+      },
       view(sessionKey: string | Accessor<string>) {
         const key = typeof sessionKey === "function" ? sessionKey : () => sessionKey