fix: resolve frontend TypeScript build errors

Author: ComputerOracle

frontend/src/lib/contract/types.ts

@@ -1,9 +1,9 @@
 export interface Market {
-  id: u64;
+  id: number;
   creator: string;
   title: string;
   description: string;
-  end_time: u64;
+  end_time: number;
   outcomes: string[];
   resolved: boolean;
 }

frontend/src/lib/env.ts

@@ -4,10 +4,10 @@ export const STELLAR_NETWORK = {
   rpcUrl: "https://soroban-testnet.stellar.org",
 };
 
+// Access environment variable safely at runtime
 // NEXT_PUBLIC_ variables are injected at build time by Next.js
-const getContractId = () => {
-  // @ts-expect-error - process.env is injected by Next.js
-  return typeof process !== "undefined" ? process.env.NEXT_PUBLIC_CONTRACT_ID : "";
-};
-
-export const CONTRACT_ID = getContractId() || "";
+export const CONTRACT_ID = (() => {
+  if (typeof globalThis === "undefined") return "";
+  const env = (globalThis as any).process?.env;
+  return env?.NEXT_PUBLIC_CONTRACT_ID || "";
+})();

frontend/src/lib/wallet/freighter.ts

@@ -5,14 +5,18 @@ export type FreighterConnection = {
 };
 
 export async function isFreighterInstalled(): Promise<boolean> {
-  return await FreighterApi.isConnected();
+  try {
+    return await FreighterApi.isAllowed();
+  } catch {
+    return false;
+  }
 }
 
 export async function connectFreighter(): Promise<FreighterConnection | null> {
   try {
     const installed = await isFreighterInstalled();
     if (!installed) {
-      throw new Error("Freighter wallet is not installed");
+      throw new Error("Freighter wallet is not installed or not allowed");
     }
 
     const publicKey = await FreighterApi.getPublicKey();
@@ -36,10 +40,10 @@ export async function signTransaction(
   transactionXdr: string
 ): Promise<string | null> {
   try {
-    const signedXdr = await FreighterApi.signTransaction(transactionXdr, {
-      network: "TESTNET",
+    const signedTxXdr = await FreighterApi.signTransaction(transactionXdr, {
+      networkPassphrase: "Test SDF Network ; September 2015",
     });
-    return signedXdr;
+    return signedTxXdr;
   } catch (error) {
     console.error("Transaction signing error:", error);
     return null;