fix: use direct ES module imports from lamejs source files

Fixed MP3 export by importing lamejs modules directly from source:
- Import MPEGMode, Lame, and BitStream from individual source files
- Use Lame API directly instead of Mp3Encoder wrapper
- Updated TypeScript declarations for each module
- Resolves "MPEGMode is not defined" error

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

types/lamejs.d.ts

@@ -1,7 +1,31 @@
-declare module 'lamejs' {
-  export class Mp3Encoder {
-    constructor(channels: number, sampleRate: number, bitrate: number);
-    encodeBuffer(left: Int16Array, right: Int16Array): Int8Array;
-    flush(): Int8Array;
+declare module 'lamejs/src/js/MPEGMode' {
+  const MPEGMode: {
+    STEREO: number;
+    JOINT_STEREO: number;
+    DUAL_CHANNEL: number;
+    MONO: number;
+    NOT_SET: number;
+  };
+  export default MPEGMode;
+}
+
+declare module 'lamejs/src/js/Lame' {
+  export default class Lame {
+    lame_init(): any;
+    lame_init_params(gfp: any): number;
+    lame_encode_buffer(
+      gfp: any,
+      left: Int16Array,
+      right: Int16Array,
+      samples: number,
+      mp3buf: Int8Array,
+      mp3bufPos: number
+    ): number;
+    lame_encode_flush(gfp: any, mp3buf: Int8Array, mp3bufPos: number): number;
+    lame_close(gfp: any): number;
   }
 }
+
+declare module 'lamejs/src/js/BitStream' {
+  export default class BitStream {}
+}