chore: add analytics for signin

Author: apsinghdev

apps/web/src/app/providers.tsx

@@ -73,11 +73,23 @@ export function PostHogAuthTracker() {
             is_new_user: isNewUser,
           });
 
+          // Track sign-up completed for new users
+          if (isNewUser) {
+            posthog.capture("sign_up_completed", {
+              provider: provider,
+            });
+          }
+
           if (process.env.NODE_ENV === "development") {
             console.log("[Analytics] Event tracked: sign_in_completed", {
               provider,
               is_new_user: isNewUser,
             });
+            if (isNewUser) {
+              console.log("[Analytics] Event tracked: sign_up_completed", {
+                provider,
+              });
+            }
           }
 
           // Clear the sign-in tracking flags

apps/web/src/components/login/SignInPage.tsx

@@ -6,6 +6,7 @@ import { Google, Github } from "../icons/icons";
 import Image from "next/image";
 import Overlay from "../ui/overlay";
 import { useAnalytics } from "@/hooks/useAnalytics";
+import { sanitizeCallbackUrl } from "@/lib/analytics";
 
 const SignInPage = () => {
   const searchParams = useSearchParams();
@@ -35,7 +36,8 @@ const SignInPage = () => {
 
   const handleSignIn = (provider: "google" | "github") => {
     // Sanitize callback URL to prevent leaking sensitive query params or tokens
-    const sanitizedCallback = safeCallbackUrl.split("?")[0].split("#")[0];
+    // Use centralized utility for consistent sanitization
+    const sanitizedCallback = sanitizeCallbackUrl(safeCallbackUrl);
 
     // Track sign-in attempt with sanitized callback (no query params or fragments)
     trackSignInStarted(provider, sanitizedCallback);

apps/web/src/lib/analytics.ts

@@ -1,6 +1,5 @@
 /**
  * Centralized Analytics Utility for PostHog
- * No PII (email, name) is stored - only anonymous user identifiers.
  */
 
 import posthog from "posthog-js";