Remove webpack - use tsc to build as ESM

[yshterev]

This becomes even more relevant now. Current library builds as CommonJS - support for legacy is getting deprecated in modern builders.

Did a temp fix for vite 8 on gcui2, but this shiuld not be required if chipmunk build is migrated - https://github.com/mediafellows/mfx-ui-gcui2/pull/3264/changes#diff-a9a80c3870d246f4626d21119edd14d9be85a14b398f661bf8b52b533ae34856