Fix dev server

[compulim]

Changelog Entry

(No changelog for dev toolchain change.)

Description

When in the Webpack-era, we were doing: Webpack --file--> esbuild dev server --port 8000--> serve.

In the tsup-era, we only need: tsup --file--> serve.

As tsup is flushing in a streaming way, esbuild is mostly picking up non-fully-flushed file, causing issues.

Design

Removed the intermediary esbuild dev server.

Specific Changes

• Removed packages/bundle/scripts/devServer.mjs
• Updated bundle/package.json script to remove esbuild dev server
• Updated packages/test/devServer/src/index.mjs to serve webchat* from packages/bundle/dist/ directly
• Removed unused packages: chalk and http-proxy-middleware

• I have added tests and executed them locally
• I have updated CHANGELOG.md
• I have updated documentation

Review Checklist

This section is for contributors to review your work.

• kAccessibility reviewed (tab order, content readability, alt text, color contrast)
• Browser and platform compatibilities reviewed
• CSS styles reviewed (minimal rules, no z-index)
• Documents reviewed (docs, samples, live demo)
• Internationalization reviewed (strings, unit formatting)
• package.json and package-lock.json reviewed
• Security reviewed (no data URIs, check for nonce leak)
• Tests reviewed (coverage, legitimacy)

[OEvgeny]

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