maybe_landing_url signup params

frontend/apps/artcraft-website/src/components/auth/GoogleLoginButton.tsx

@@ -33,6 +33,7 @@ export function GoogleLoginButton({
       const result = await api.GoogleSSO({
         credential: credentialResponse.credential,
         maybeReferralUrl: (window as any).cached_referrer,
+        maybeLandingUrl: (window as any).cached_landing_url,
       });
       if (result.success) {
         window.dispatchEvent(new Event("auth-change"));

frontend/apps/artcraft-website/src/components/auth/signup-form.tsx

@@ -58,6 +58,7 @@ export const SignupForm = ({
       passwordConfirmation: password,
       signupSource,
       maybeReferralUrl: (window as any).cached_referrer,
+      maybeLandingUrl: (window as any).cached_landing_url,
     });
 
     setIsLoading(false);

frontend/apps/artcraft-website/src/components/pricing-table/pricing-table.tsx

@@ -193,6 +193,7 @@ const PricingTable = ({
           plan: apiPlanSlug,
           cadence: cadence,
           maybeReferralUrl: (window as any).cached_referrer,
+          maybeLandingUrl: (window as any).cached_landing_url,
         });
 
         if (!response.success || !response.data) {

frontend/apps/artcraft-website/src/main.tsx

@@ -26,6 +26,9 @@ if (import.meta.env.DEV) {
 if (!(window as any).cached_referrer) {
   (window as any).cached_referrer = document.referrer || undefined;
 }
+if (!(window as any).cached_landing_url) {
+  (window as any).cached_landing_url = window.location.href || undefined;
+}
 
 // Fire-and-forget: log the referral once per browser session
 if (!sessionStorage.getItem("referral_logged")) {

frontend/libs/api/src/lib/BillingApi.ts

@@ -35,15 +35,17 @@ export class BillingApi extends ApiManager {
     plan,
     cadence,
     maybeReferralUrl,
+    maybeLandingUrl,
   }: {
     plan: string;
     cadence: "yearly" | "monthly";
     maybeReferralUrl?: string;
+    maybeLandingUrl?: string;
   }): Promise<ApiResponse<{ stripeCheckoutRedirectUrl: string }>> {
     const endpoint = `${this.getApiSchemeAndHost()}/v1/stripe_artcraft/user_signup_subscription_checkout`;
 
     return await this.post<
-      { plan: string; cadence: string; maybe_referral_url?: string },
+      { plan: string; cadence: string; maybe_referral_url?: string; maybe_landing_url?: string },
       {
         success: boolean;
         stripe_checkout_redirect_url?: string;
@@ -55,6 +57,7 @@ export class BillingApi extends ApiManager {
         plan,
         cadence,
         ...(maybeReferralUrl && { maybe_referral_url: maybeReferralUrl }),
+        ...(maybeLandingUrl && { maybe_landing_url: maybeLandingUrl }),
       },
     })
       .then((response) => ({

frontend/libs/api/src/lib/UsersApi.ts

@@ -9,6 +9,7 @@ interface SignupRequest {
   password_confirmation: string;
   signup_source?: string;
   maybe_referral_url?: string;
+  maybe_landing_url?: string;
 }
 
 export class UsersApi extends ApiManager {
@@ -202,6 +203,7 @@ export class UsersApi extends ApiManager {
     passwordConfirmation,
     signupSource,
     maybeReferralUrl,
+    maybeLandingUrl,
   }: {
     username: string;
     email: string;
@@ -209,6 +211,7 @@ export class UsersApi extends ApiManager {
     passwordConfirmation: string;
     signupSource?: string;
     maybeReferralUrl?: string;
+    maybeLandingUrl?: string;
   }): Promise<ApiResponse<{ signedSession?: string }>> {
     const endpoint = `${this.getApiSchemeAndHost()}/v1/create_account`;
     const body: SignupRequest = {
@@ -223,6 +226,9 @@ export class UsersApi extends ApiManager {
     if (maybeReferralUrl) {
       body.maybe_referral_url = maybeReferralUrl;
     }
+    if (maybeLandingUrl) {
+      body.maybe_landing_url = maybeLandingUrl;
+    }
 
     try {
       const response = await this.authFetch<
@@ -259,17 +265,22 @@ export class UsersApi extends ApiManager {
   public async GoogleSSO({
     credential,
     maybeReferralUrl,
+    maybeLandingUrl,
   }: {
     credential: string;
     maybeReferralUrl?: string;
+    maybeLandingUrl?: string;
   }): Promise<ApiResponse<{ usernameNotYetCustomized?: boolean }>> {
     const endpoint = `${this.getApiSchemeAndHost()}/v1/accounts/google_sso`;
-    const body: { google_credential: string; maybe_referral_url?: string } = {
+    const body: { google_credential: string; maybe_referral_url?: string; maybe_landing_url?: string } = {
       google_credential: credential,
     };
     if (maybeReferralUrl) {
       body.maybe_referral_url = maybeReferralUrl;
     }
+    if (maybeLandingUrl) {
+      body.maybe_landing_url = maybeLandingUrl;
+    }
 
     try {
       const response = await this.authFetch<