fix: add stub default export

[danielroe]

allows it to be imported by .nuxt/index.js without throwing an error

[codecov]

Codecov Report

Merging #157 (8984a56) into main (f396cfa) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #157   +/-   ##
=======================================
  Coverage   85.71%   85.71%           
=======================================
  Files           7        7           
  Lines         168      168           
  Branches       44       44           
=======================================
  Hits          144      144           
  Misses         24       24           

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[pi0]

Nuxt plugins export is optional. Issue with vite support is unrelated.