Improvements

[timea-solid]

drop node 18
new structure

[Copilot]

Pull Request Overview

This PR modernizes the codebase by dropping Node 18 support and restructuring the build system to use ES modules and a production-focused webpack configuration.

Key Changes:

• Migrated from CommonJS to ES modules throughout the codebase
• Replaced var declarations with const and let for better scoping
• Restructured build configuration separating development and production webpack configs

Reviewed Changes

Copilot reviewed 11 out of 14 changed files in this pull request and generated 13 comments.

Show a summary per file

File	Description
webpack.dev.config.js	New development webpack configuration using ES module exports
webpack.config.js	Production webpack config with UMD library output and ES module syntax
timestamp.sh	Removed build-time version info script
src/versionInfo.ts	Removed auto-generated version metadata file
src/meetingPane.js	Converted to ES modules, replaced var with const/let, updated string literals
package.json	Updated build scripts, main entry point, and dependencies
eslint.config.mjs	Reconfigured with neostandard preset and stricter rules
dev/index.js	Converted to ES module imports
babel.config.js	Created ES module babel config
.github/workflows/ci.yml	Removed Node 18 from CI matrix
.babelrc	Removed in favor of babel.config.js

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