diff --git a/apps/web/src/hooks/usePanes.ts b/apps/web/src/hooks/usePanes.ts
index 0f4481b..c17217c 100644
--- a/apps/web/src/hooks/usePanes.ts
+++ b/apps/web/src/hooks/usePanes.ts
@@ -78,9 +78,8 @@ export function usePanes(sessionId: string | undefined): {
 
   const update = useCallback(
     async (id: string, body: PaneUpdateRequest): Promise<void> => {
-      const stateOnly = body.state !== undefined && body.position === undefined;
-
-      if (stateOnly) {
+      if (body.state !== undefined && body.position === undefined) {
+        const nextState = body.state;
         // Optimistic local update
         setPanes((prev) => {
           if (!prev) return prev;
@@ -90,10 +89,10 @@ export function usePanes(sessionId: string | undefined): {
             changed = true;
             // Narrow via discriminated union to satisfy TypeScript
             if (pane.kind === 'chat') {
-              return { ...pane, state: body.state as typeof pane.state };
+              return { ...pane, state: nextState as typeof pane.state };
             }
             if (pane.kind === 'file_browser') {
-              return { ...pane, state: body.state as typeof pane.state };
+              return { ...pane, state: nextState as typeof pane.state };
             }
             return pane;
           });
@@ -101,7 +100,6 @@ export function usePanes(sessionId: string | undefined): {
         });
 
         // Coalesce: last state wins within debounce window
-        const nextState = body.state;
         pendingState.current.set(id, nextState);
 
         if (debounceTimer.current !== null) {