refactor macos support into single file

unlock.ts

@@ -1,15 +1,38 @@
-const localAppData = Deno.env.get("LOCALAPPDATA");
+const os = Deno.build.os;
+
+let localStatePathPattern: (version: string) => string;
+
+if (os === "windows") {
+  const localAppData = Deno.env.get("LOCALAPPDATA");
+  if (!localAppData) {
+    console.error("Error: LOCALAPPDATA environment variable not found.");
+    Deno.exit(1);
+  }
+  localStatePathPattern = (version) =>
+    `${localAppData}\\BraveSoftware\\${version}\\User Data\\Local State`;
+} else if (os === "darwin") {
+  const homeDir = Deno.env.get("HOME");
+  if (!homeDir) {
+    console.error("Error: HOME environment variable not found.");
+    Deno.exit(1);
+  }
+  localStatePathPattern = (version) =>
+    `${homeDir}/Library/Application Support/BraveSoftware/${version}/Local State`;
+} else {
+  console.error(`Error: Unsupported operating system: ${os}`);
+  Deno.exit(1);
+}
 
 const versions = ["Brave-Origin", "Brave-Origin-Beta", "Brave-Origin-Nightly"];
 let foundAny = false;
 
 for (const version of versions) {
-  const localStatePath =
-    `${localAppData}\\BraveSoftware\\${version}\\User Data\\Local State`;
+  const localStatePath = localStatePathPattern(version);
 
   try {
     const localState = JSON.parse(await Deno.readTextFile(localStatePath));
 
+    localState.brave = localState.brave || {};
     localState.brave.origin = { purchase_validated: true };
 
     localState.skus = {