Fix stale ref reads in ChatComposer and remove dead probeCodexAccount export

- Move composerMenuOpenRef, composerMenuItemsRef, and activeComposerMenuItemRef
  assignments back to synchronous render phase instead of useEffect, preventing
  stale reads during fast keypresses between render commit and effect execution.
- Remove unused probeCodexAccount function from codexAppServer.ts (replaced by
  probeCodexDiscovery at all call sites).

Author: cursoragent

apps/server/src/provider/codexAppServer.ts

@@ -244,16 +244,3 @@ export async function probeCodexDiscovery(input: {
     });
   });
 }
-
-export async function probeCodexAccount(input: {
-  readonly binaryPath: string;
-  readonly homePath?: string;
-  readonly signal?: AbortSignal;
-}): Promise<CodexAccountSnapshot> {
-  return (
-    await probeCodexDiscovery({
-      ...input,
-      cwd: process.cwd(),
-    })
-  ).account;
-}

apps/web/src/components/chat/ChatComposer.tsx

@@ -820,11 +820,9 @@ export const ChatComposer = memo(
       [composerHighlightedItemId, composerMenuItems],
     );
 
-    useEffect(() => {
-      composerMenuOpenRef.current = composerMenuOpen;
-      composerMenuItemsRef.current = composerMenuItems;
-      activeComposerMenuItemRef.current = activeComposerMenuItem;
-    }, [activeComposerMenuItem, composerMenuItems, composerMenuOpen]);
+    composerMenuOpenRef.current = composerMenuOpen;
+    composerMenuItemsRef.current = composerMenuItems;
+    activeComposerMenuItemRef.current = activeComposerMenuItem;
 
     const nonPersistedComposerImageIdSet = useMemo(
       () => new Set(nonPersistedComposerImageIds),