Add Pendo trackAgent instrumentation for AI chat interactions

Track user prompts and agent responses via pendo.trackAgent() to enable
analytics on conversational AI usage within the BrowseGPT extension.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: claude

extension/shared/global.d.ts

@@ -1,6 +1,8 @@
 declare module '*.png'
 declare module '*.jpg'
 
+declare var pendo: { trackAgent: (eventType: string, metadata: object) => void }
+
 declare type User = {
     id: string
     email: string

extension/shared/pages/chat.tsx

@@ -77,6 +77,15 @@ const Chat: FC = () => {
 
     const sendMessageMutation = trpc.sendMessage.useMutation({
         onSuccess: (newMessage: Message, context) => {
+            if (typeof pendo !== 'undefined') {
+                pendo.trackAgent("agent_response", {
+                    agentId: "xVQwu1YJtAIP58_Z4pR49NyDu8w",
+                    conversationId: openChat.id,
+                    messageId: crypto.randomUUID(),
+                    content: newMessage.content,
+                    modelUsed: "gpt-4o-mini",
+                })
+            }
             setOpenChat({
                 ...openChat,
                 messages: [...openChat.messages, newMessage],
@@ -264,6 +273,16 @@ const Chat: FC = () => {
                 },
             ])
         }
+        const promptMessageId = crypto.randomUUID()
+        if (typeof pendo !== 'undefined') {
+            pendo.trackAgent("prompt", {
+                agentId: "xVQwu1YJtAIP58_Z4pR49NyDu8w",
+                conversationId: openChat.id,
+                messageId: promptMessageId,
+                content: strippedMessage,
+                suggestedPrompt: !!selectedCommand,
+            })
+        }
         sendMessageMutation.mutate({
             chatId: openChat.id,
             message: newMessage,