Scaffold Vite build toolchain + scientific chemistry/engineering dashboard

[Copilot]

Replaces the vanilla-file business card PWA with an interactive scientific dashboard (Carbon-12 and companion models), and adds a proper npm + Vite build pipeline with hashed output and GitHub Pages deployment support.

Dashboard

• Three-panel layout: Carbon-12 overview · canvas model explorer · live metrics sidebar
• Canvas-animated models: Carbon-12, Carbon-13, CH₄ (methane), planetary gear train, axial turbine stage
• Model switcher (dropdown + quick buttons) updates metrics and description in sync
• Dark/light theme toggle preserved; service worker updated with a lazy-cache strategy compatible with Vite's hashed filenames

Build scaffold

• package.json with dev / build / preview scripts (Vite 8)
• vite.config.js sets base: '/rag7/' for GitHub Pages project-site routing
• Sources moved to src/ (CSS imported as ES module); PWA statics (manifest.json, sw.js) in public/
• Build emits content-hashed bundles to dist/ (~7 kB JS · ~3 kB CSS, gzipped)

dist/index.html
dist/assets/index-BIRz7rSW.js   7.11 kB │ gzip: 3.02 kB
dist/assets/index-CaiheSJ0.css  3.13 kB │ gzip: 1.23 kB
dist/manifest.json
dist/sw.js

PWA / SW

public/sw.js rewrites from an explicit file list (broken with hashed names) to a lazy network-then-cache strategy — assets are cached on first fetch, navigation falls back to index.html offline.