Set up initial project and files

src/types/mailparser.d.ts

@@ -0,0 +1,17 @@
+// Extend mailparser types for Buffer in worker environment
+declare module 'buffer-polyfill' {
+  global {
+    var Buffer: {
+      from(data: string, encoding?: string): {
+        toString(encoding?: string): string;
+      };
+    };
+  }
+}
+
+// Add missing atob declaration
+declare module 'atob-polyfill' {
+  global {
+    function atob(data: string): string;
+  }
+}