fix: install lamejs from GitHub repo for proper browser support

Switched from npm package to GitHub repo (github:zhuker/lamejs) which
includes the proper browser build. Reverted to simple dynamic import.

Fixes MP3 export MPEGMode reference error.

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

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

pnpm-lock.yaml

@@ -15,8 +15,8 @@ importers:
         specifier: ^0.8.2
         version: 0.8.2
       lamejs:
-        specifier: ^1.2.1
-        version: 1.2.1
+        specifier: github:zhuker/lamejs
+        version: https://codeload.github.com/zhuker/lamejs/tar.gz/582bbba6a12f981b984d8fb9e1874499fed85675
       lucide-react:
         specifier: ^0.553.0
         version: 0.553.0(react@19.2.0)
@@ -1384,8 +1384,9 @@ packages:
   keyv@4.5.4:
     resolution: {integrity: sha512-oxVHkHR/EJf2CNXnWxRLW6mg7JyCCUcG0DtEGmL2ctUo1PNTin1PUil+r/+4r5MpVgC/fn1kjsx7mjSujKqIpw==}
 
-  lamejs@1.2.1:
-    resolution: {integrity: sha512-s7bxvjvYthw6oPLCm5pFxvA84wUROODB8jEO2+CE1adhKgrIvVOlmMgY8zyugxGrvRaDHNJanOiS21/emty6dQ==}
+  lamejs@https://codeload.github.com/zhuker/lamejs/tar.gz/582bbba6a12f981b984d8fb9e1874499fed85675:
+    resolution: {tarball: https://codeload.github.com/zhuker/lamejs/tar.gz/582bbba6a12f981b984d8fb9e1874499fed85675}
+    version: 1.2.1
 
   language-subtag-registry@0.3.23:
     resolution: {integrity: sha512-0K65Lea881pHotoGEa5gDlMxt3pctLi2RplBb7Ezh4rRdLEOtgi7n4EwK9lamnUCkKBqaeKRVebTq6BAxSkpXQ==}
@@ -3412,7 +3413,7 @@ snapshots:
     dependencies:
       json-buffer: 3.0.1
 
-  lamejs@1.2.1:
+  lamejs@https://codeload.github.com/zhuker/lamejs/tar.gz/582bbba6a12f981b984d8fb9e1874499fed85675:
     dependencies:
       use-strict: 1.0.1