chore(cli): code cleanup from review feedback

- Remove duplicate AskUserContentBlock from ContentBlock union type
- Remove unused execSync import from clipboard-image.ts
- Fix Ctrl+V to fall through for text paste when no image in clipboard
- Fix buildUserMessageContent to wrap text in user_message tags for multipart content

Author: brandonkachen

cli/src/chat.tsx

@@ -951,21 +951,22 @@ export const Chat = ({
       // Check if clipboard has an image
       if (!hasClipboardImage()) {
         // No image in clipboard, let normal paste happen
-        return
+        return false
       }
 
       // Read image from clipboard
       const result = readClipboardImage()
       if (!result.success || !result.imagePath || !result.filename) {
         showClipboardMessage(result.error || 'Failed to paste image', { durationMs: 3000 })
-        return
+        return true // We handled it (with an error), don't let default paste happen
       }
 
       // Add to pending images
       useChatStore.getState().addPendingImage({
         path: result.imagePath,
         filename: result.filename,
       })
+      return true // Image was pasted successfully
     },
   }), [
     setInputMode,

cli/src/hooks/use-chat-keyboard.ts

@@ -59,7 +59,7 @@ export type ChatKeyboardHandlers = {
   onExitApp: () => void
 
   // Clipboard handlers
-  onPasteImage: () => void
+  onPasteImage: () => boolean // Returns true if an image was pasted
 }
 
 /**
@@ -158,8 +158,7 @@ function dispatchAction(
       handlers.onExitApp()
       return true
     case 'paste-image':
-      handlers.onPasteImage()
-      return true
+      return handlers.onPasteImage()
     case 'none':
       return false
   }

cli/src/types/chat.ts

@@ -120,7 +120,6 @@ export type ContentBlock =
   | TextContentBlock
   | ToolContentBlock
   | PlanContentBlock
-  | AskUserContentBlock
 
 export type AgentMessage = {
   agentName: string

cli/src/utils/clipboard-image.ts

@@ -1,4 +1,4 @@
-import { execSync, spawnSync } from 'child_process'
+import { spawnSync } from 'child_process'
 import { existsSync, mkdirSync, writeFileSync } from 'fs'
 import path from 'path'
 import os from 'os'