js: migrate from Webpack to esbuild

[sectore]

Why?

Webpack is just used to bundle / minify / watch TS sources. In 2026 we do have better options to replace Webpack for such tasks, which is slow in general. One common option is esbuild (simple to use + very fast). Check its Benchmark details comparing to Webpack.

Changes

• use esbuild to get rid of Webpack entirely
• update build/dev scripts
• fix TS warnings: Boolean -> boolean, require -> import
• remove all client/dist/*.d.ts files (needed if Hyperbole client is a JS/TS library, which seems not to be the case).
• update tsconfig.json
• update deps in package.json