Changes to update build process to fix vulnerabilities

[jackWhtman]

What I updated

• Replaced legacy Browserify pipeline in package.json with esbuild:
• build now runs build:js + build:min
• build:js bundles to leaflet-side-by-side.js
• build:min bundles + minifies to leaflet-side-by-side.min.js
• start now uses esbuild --watch --servedir=.
• inline layout.css and range.css at runtime via injected <style> tags so CSS behavior remains packaged with JS output
• replaced CSS background-image URL for range-icon.png with base64 value for image

Removed old build dependencies:

• browserify, browserify-shim, budo, cssify, terser

Added modern build dependency:

• esbuild

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	esbuild@​0.25.12
	standard@​11.0.1 ⏵ 17.1.2	+1		+1

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