fix(core): rename from .es.js to .js

[etowahadams]

I upgraded vite and didn't realize that it also changes the extensions of the dist files. Just updated to reflect this.

Change List

• renames exports in package.json

Checklist

• Ensure the PR works with all demos on the online editor
• Unit tests added or updated
• Examples added or updated
• Documentation updated (e.g., added API functions)
• Screenshots for visual changes (e.g., new encoding support or UI change on Editor)