fix(stage-ui): simplify ttfm tracking

Author: shinohara-rin

packages/stage-ui/src/composables/use-analytics.ts

@@ -12,22 +12,21 @@ export function useAnalytics() {
     })
   }
 
-  function trackFirstMessage(success: boolean, messageSentAt: number) {
+  function trackFirstMessage() {
     // Only track the first message once
     if (analyticsStore.firstMessageTracked)
       return
 
+    analyticsStore.markFirstMessageTracked()
+
     // Calculate time from app start to message sent
     const timeToFirstMessageMs = analyticsStore.appStartTime
-      ? messageSentAt - analyticsStore.appStartTime
+      ? Date.now() - analyticsStore.appStartTime
       : null
 
     posthog.capture('first_message_sent', {
       time_to_first_message_ms: timeToFirstMessageMs,
-      success,
     })
-
-    analyticsStore.markFirstMessageTracked()
   }
 
   return {

packages/stage-ui/src/stores/chat.ts

@@ -437,8 +437,7 @@ export const useChatStore = defineStore('chat', () => {
     }
     streamingMessage.value = { role: 'assistant', content: '', slices: [], tool_results: [], context: assistantContext }
 
-    // Capture send time for first message analytics
-    const messageSentAt = Date.now()
+    trackFirstMessage()
 
     try {
       await emitBeforeMessageComposedHooks(sendingMessage)
@@ -615,14 +614,10 @@ export const useChatStore = defineStore('chat', () => {
       console.debug('LLM output:', fullText)
 
       await emitAfterSendHooks(sendingMessage)
-
-      trackFirstMessage(true, messageSentAt)
     }
     catch (error) {
       console.error('Error sending message:', error)
 
-      trackFirstMessage(false, messageSentAt)
-
       throw error
     }
     finally {