[mercury][migration-script] Fix bug due to "update" argument being used for the directory

Author: bsastregx

packages/mercury/src/cli/migrate-mercury-tokens.ts

@@ -8,8 +8,9 @@
  * Version: 1.0.0
  *
  * USAGE:
- * 1. Download this file to your project root
- * 2. Run: node migrate-mercury-tokens.js
+ * 1. Run from your project root: bunx mercury update
+ * 2. Or with a specific directory: bunx mercury update ./src
+ * 3. Legacy: node migrate-mercury-tokens.js [directory]
  *
  * The script will:
  * - Find all CSS, SCSS, JS, TS, JSX, TSX files
@@ -361,7 +362,18 @@ export function migrateMercuryTokens() {
   printHeader();
   console.log("═".repeat(80));
 
-  const targetDir = process.argv[2] || process.cwd();
+  // Handle command parsing
+  const args = process.argv.slice(2);
+  const command = args[0];
+
+  // If first arg is "update", use current directory
+  // Otherwise treat first arg as the target directory
+  let targetDir;
+  if (command === "update") {
+    targetDir = args[1] || process.cwd();
+  } else {
+    targetDir = command || process.cwd();
+  }
 
   if (!fs.existsSync(targetDir)) {
     console.error(`\n❌ Error: Directory "${targetDir}" does not exist`);