fix(app): message list overflow & scrolling (#9530)

packages/app/src/pages/session.tsx

@@ -824,10 +824,22 @@ export default function Page() {
   })
 
   const isWorking = createMemo(() => status().type !== "idle")
+
   const autoScroll = createAutoScroll({
-    working: isWorking,
+    working: () => true
   })
 
+  createEffect(
+    on(
+      isWorking,
+      (working, prev) => {
+        if (!working || prev) return
+        autoScroll.forceScrollToBottom()
+      },
+      { defer: true },
+    ),
+  )
+
   let scrollSpyFrame: number | undefined
   let scrollSpyTarget: HTMLDivElement | undefined
 
@@ -1340,10 +1352,6 @@ export default function Page() {
                                   classList={{
                                     "min-w-0 w-full max-w-full": true,
                                     "md:max-w-200": !showTabs(),
-                                    "last:min-h-[calc(100vh-5.5rem-var(--prompt-height,8rem)-64px)] md:last:min-h-[calc(100vh-4.5rem-var(--prompt-height,10rem)-64px)]":
-                                      platform.platform !== "desktop",
-                                    "last:min-h-[calc(100vh-7rem-var(--prompt-height,8rem)-64px)] md:last:min-h-[calc(100vh-6rem-var(--prompt-height,10rem)-64px)]":
-                                      platform.platform === "desktop",
                                   }}
                                 >
                                   <SessionTurn