fix: ESM dev entrypoint was causing unexpected behaviors

[semoal]

Resolves #1003 and #1063 and probably some other's which I closed because didn't know this happened.

[vercel]

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[github-actions]

size-limit report 📦

Path	Size
./packages/core/build/cjs/core.production.min.js	2.78 KB (0%)
./packages/detect-locale/build/cjs/detect-locale.production.min.js	798 B (0%)
./packages/react/build/cjs/react.production.min.js	4.85 KB (0%)

[codecov]

Codecov Report

Merging #1059 (0ee8604) into main (78ad09f) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1059   +/-   ##
=======================================
  Coverage   83.06%   83.06%           
=======================================
  Files          53       53           
  Lines        1624     1624           
  Branches      443      443           
=======================================
  Hits         1349     1349           
  Misses        158      158           
  Partials      117      117           

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