feat(posthog): Add posthog log for signup failed

apps/sim/app/(auth)/signup/signup-form.tsx

@@ -261,6 +261,9 @@ function SignupFormContent({
           widget.execute()
           token = await widget.getResponsePromise()
         } catch {
+          captureEvent(posthog, 'signup_failed', {
+            error_code: 'captcha_client_failure',
+          })
           setFormError('Captcha verification failed. Please try again.')
           setIsLoading(false)
           return
@@ -284,7 +287,9 @@ function SignupFormContent({
             logger.error('Signup error:', ctx.error)
             const errorMessage: string[] = ['Failed to create account']
 
+            let errorCode = 'unknown'
             if (ctx.error.code?.includes('USER_ALREADY_EXISTS')) {
+              errorCode = 'user_already_exists'
               errorMessage.push(
                 'An account with this email already exists. Please sign in instead.'
               )
@@ -293,31 +298,39 @@ function SignupFormContent({
               ctx.error.code?.includes('BAD_REQUEST') ||
               ctx.error.message?.includes('Email and password sign up is not enabled')
             ) {
+              errorCode = 'signup_disabled'
               errorMessage.push('Email signup is currently disabled.')
               setEmailError(errorMessage[0])
             } else if (ctx.error.code?.includes('INVALID_EMAIL')) {
+              errorCode = 'invalid_email'
               errorMessage.push('Please enter a valid email address.')
               setEmailError(errorMessage[0])
             } else if (ctx.error.code?.includes('PASSWORD_TOO_SHORT')) {
+              errorCode = 'password_too_short'
               errorMessage.push('Password must be at least 8 characters long.')
               setPasswordErrors(errorMessage)
               setShowValidationError(true)
             } else if (ctx.error.code?.includes('PASSWORD_TOO_LONG')) {
+              errorCode = 'password_too_long'
               errorMessage.push('Password must be less than 128 characters long.')
               setPasswordErrors(errorMessage)
               setShowValidationError(true)
             } else if (ctx.error.code?.includes('network')) {
+              errorCode = 'network_error'
               errorMessage.push('Network error. Please check your connection and try again.')
               setPasswordErrors(errorMessage)
               setShowValidationError(true)
             } else if (ctx.error.code?.includes('rate limit')) {
+              errorCode = 'rate_limited'
               errorMessage.push('Too many requests. Please wait a moment before trying again.')
               setPasswordErrors(errorMessage)
               setShowValidationError(true)
             } else {
               setPasswordErrors(errorMessage)
               setShowValidationError(true)
             }
+
+            captureEvent(posthog, 'signup_failed', { error_code: errorCode })
           },
         }
       )

apps/sim/lib/posthog/events.ts

@@ -16,6 +16,10 @@ export interface PostHogEventMap {
 
   signup_page_viewed: Record<string, never>
 
+  signup_failed: {
+    error_code: string
+  }
+
   subscription_created: {
     plan: string
     status: string