Send Better Auth session token with tRPC

lib/auth-cookie.ts

@@ -7,6 +7,8 @@ import { normalizeSecureStoreKey } from "@/lib/secure-store-keys";
 type AuthClient = ReturnType<typeof createAuthClient>;
 
 const CHUNK_MARKER = "\u0001ba-chunks:";
+const SESSION_TOKEN_COOKIE_PART =
+  /(?:^|;\s*)(?:__Secure-)?[^=]*session_token=([^;]+)/;
 
 function readSecureStoreValueSync(key: string): string | null {
   const value = SecureStore.getItem(key);
@@ -49,7 +51,13 @@ export function getAuthCookieHeaders(
   storagePrefix: string,
 ): Record<string, string> {
   const cookie = getAuthCookie(authClient, storagePrefix);
-  return cookie
-    ? { cookie, Cookie: cookie, "x-beenvoice-auth-cookie": cookie }
-    : {};
+  if (!cookie) return {};
+
+  const sessionToken = cookie.match(SESSION_TOKEN_COOKIE_PART)?.[1];
+  return {
+    cookie,
+    Cookie: cookie,
+    "x-beenvoice-auth-cookie": cookie,
+    ...(sessionToken ? { "x-beenvoice-session-token": sessionToken } : {}),
+  };
 }