Improvements

[timea-solid]

This is work done to improve different aspects of the library:

• droppen node 18
• better and state of the art configs
• generation of a better bundles (UMD and ESM) file for direct web usage (powered by webpack)
• version info
• clean dependencies

[Copilot]

Pull Request Overview

This PR modernizes the solid-ui library build system and development workflow, dropping Node.js 18 support in favor of more modern tooling and ESM/UMD bundles.

• Replaced babel-based compilation with TypeScript, webpack for multiple bundle formats (UMD/ESM)
• Updated import/export statements from CommonJS to ES modules throughout the codebase
• Modernized configuration files and improved linting rules

Reviewed Changes

Copilot reviewed 123 out of 149 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
webpack.config.js	Complete rewrite to generate multiple bundle formats (UMD/ESM, minified/unminified, with/without rdflib)
package.json	Updated build scripts, dependencies, and main entry points for new build system
src/ files	Mass conversion from import * as ns to import ns and similar module import modernization
test/ files	Updated imports and removed unused variables to match new module system
config files	New babel.config.js, updated eslint.config.mjs, removed .babelrc

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