Improved structure

[timea-solid]

Dropped node 18
improved configs
improved structure

[Copilot]

Pull Request Overview

This PR modernizes the project structure by dropping Node.js 18 support, restructuring the build configuration, and implementing various code improvements including better linting rules, updated dependencies, and code style consistency.

Key Changes

• Dropped Node 18 support from CI workflow and updated build tooling
• Restructured file organization with new src/ and dist/ directories
• Enhanced ESLint configuration with neostandard and TypeScript support
• Updated import paths to use new directory structure

Reviewed Changes

Copilot reviewed 31 out of 39 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
webpack.config.js	Added webpack configuration for building multiple entry points with polyfills
package.json	Updated build scripts, dependencies, and main entry point to use dist directory
eslint.config.mjs	Replaced old config with comprehensive neostandard-based configuration
babel.config.js	Converted to ES module syntax
Makefile	Updated build targets to output to dist directory
.github/workflows/ci.yml	Removed Node 18 from test matrix
test/unit/setup.ts	Moved test setup file from tests to test directory
test/unit/data-reformat-test.test.ts	Updated imports and modernized test syntax
src/*.js	Updated import paths and applied code style improvements

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