fix(app): make session navigation stable and fast (#33569)

Co-authored-by: Brendan Allan <git@brendonovich.dev>

packages/app/src/context/directory-sync.ts

@@ -187,7 +187,7 @@ export const createDirSyncContext = (
     return serverSync.child(directory)
   }
   const absolute = (path: string) => (current()[0].path.directory + "/" + path).replace("//", "/")
-  const initialMessagePageSize = 80
+  const initialMessagePageSize = 2
   const historyMessagePageSize = 200
   const inflight = new Map<string, Promise<void>>()
   const inflightDiff = new Map<string, Promise<void>>()

packages/app/src/context/global.tsx

@@ -8,11 +8,13 @@ import { createServerSyncContext } from "./server-sync"
 import { getOwner } from "solid-js/web"
 import { QueryClient } from "@tanstack/solid-query"
 import type { ServerScope } from "@/utils/server-scope"
+import { createSessionPlacementStore } from "@/utils/session-placement"
 
 export const { use: useGlobal, provider: GlobalProvider } = createSimpleContext({
   name: "Global",
   init: () => {
     const server = useServer()
+    const sessionPlacement = createSessionPlacementStore()
     const serverHealth = useServerHealth(
       () => server.list,
       () => true,
@@ -85,6 +87,7 @@ export const { use: useGlobal, provider: GlobalProvider } = createSimpleContext(
           },
         },
       },
+      sessionPlacement,
       createServerCtx(conn: ServerConnection.Any) {
         return ensureServerCtx(conn)
       },