fix: a2ui actions were not wired up at all

src/renderer/a2ui/useA2UISurface.ts

@@ -8,7 +8,7 @@
 import { useCallback, useEffect, useMemo, useRef, useState } from 'react';
 import { A2UISurfaceManager } from './A2UISurfaceManager';
 import { replaySurfacesFromMessages } from './surfaceAssociation';
-import type { A2UIResolvedComponent, A2UIServerMessage, A2UIClientAction } from '../../main/a2ui/types';
+import type { A2UIResolvedComponent, A2UIServerMessage } from '../../main/a2ui/types';
 import type { ChatMessage } from '../../main/shared/electronApi';
 
 interface UseA2UISurfaceInput {
@@ -31,8 +31,6 @@ interface UseA2UISurfaceResult {
   dismissedSurfaceIds: Set<string>;
   /** Dismiss a surface by ID */
   dismissSurface: (surfaceId: string) => void;
-  /** Dispatch an action back to the main process */
-  dispatchAction: (action: A2UIClientAction) => void;
   /** Update a local data binding (for form inputs) */
   updateLocalData: (surfaceId: string, path: string, value: unknown) => void;
   /** Get the data model for a surface */
@@ -148,10 +146,6 @@ export function useA2UISurface(input: UseA2UISurfaceInput): UseA2UISurfaceResult
     });
   }, []);
 
-  const dispatchAction = useCallback((action: A2UIClientAction) => {
-    window.electronAPI?.chat.dispatchA2UIAction?.(action);
-  }, []);
-
   const updateLocalData = useCallback((surfaceId: string, path: string, value: unknown) => {
     managerRef.current.updateLocalData(surfaceId, path, value);
   }, []);
@@ -183,7 +177,6 @@ export function useA2UISurface(input: UseA2UISurfaceInput): UseA2UISurfaceResult
     latestSurfaceId,
     dismissedSurfaceIds,
     dismissSurface,
-    dispatchAction,
     updateLocalData,
     getDataModel,
     clearSurfaces,

src/renderer/components/AssistantSidebar/AssistantSidebar.tsx

@@ -59,7 +59,6 @@ export const AssistantSidebar: React.FC = () => {
     latestSurfaceId,
     dismissedSurfaceIds,
     dismissSurface,
-    dispatchAction,
     updateLocalData,
   } = useA2UISurface({ conversationId });
 
@@ -281,7 +280,7 @@ export const AssistantSidebar: React.FC = () => {
             latestSurfaceId={latestSurfaceId}
             dismissedSurfaceIds={dismissedSurfaceIds}
             onSurfaceDismiss={dismissSurface}
-            onSurfaceAction={dispatchAction}
+            onSurfaceAction={(a) => handleAssistantAction(a.action, a.payload)}
             onSurfaceDataChange={updateLocalData}
             currentTurnIndex={currentTurnIndex}
           />

src/renderer/components/ChatPanel/ChatPanel.tsx

@@ -64,7 +64,6 @@ export const ChatPanel: React.FC<ChatPanelProps> = ({ conversationId }) => {
     latestSurfaceId,
     dismissedSurfaceIds,
     dismissSurface,
-    dispatchAction,
     updateLocalData,
     replayFromMessages,
   } = useA2UISurface({ conversationId });
@@ -387,7 +386,7 @@ export const ChatPanel: React.FC<ChatPanelProps> = ({ conversationId }) => {
           latestSurfaceId={latestSurfaceId}
           dismissedSurfaceIds={dismissedSurfaceIds}
           onSurfaceDismiss={dismissSurface}
-          onSurfaceAction={dispatchAction}
+          onSurfaceAction={(a) => handleAssistantAction(a.action, a.payload)}
           onSurfaceDataChange={updateLocalData}
           currentTurnIndex={currentTurnIndex}
         />