Frontend uudelleenrakennettu: Astro-komponentit, Wasm pääsäikeessä, ei Workeria

Vanha frontend siirretty temp/. Uusi rakenne:
- StatusBar.astro, Terminal.astro, Editor.astro, Guide.astro
- global.css erillinen
- Wasm pääsäikeessä (ei Worker — yksinkertainen, debugattava)
- Tab-completion, dropdown, projektikortti, Monaco, GUIDE.md
- Ei tokenisointia eikä koodilaboratoriota

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

network-poc/frontend/node_modules/node-fetch-native/dist/polyfill.mjs

@@ -0,0 +1 @@
+var i=Object.defineProperty;var e=(r,t)=>i(r,"name",{value:t,configurable:!0});import{fetch as l,Blob as m,File as p,FormData as a,Headers as n,Request as s,Response as b,AbortController as f}from"./node.mjs";import"node:http";import"node:https";import"node:zlib";import"node:stream";import"node:buffer";import"node:util";import"./shared/node-fetch-native.DfbY2q-x.mjs";import"node:url";import"node:net";import"node:fs";import"node:path";var c=Object.defineProperty,u=e((r,t)=>c(r,"name",{value:t,configurable:!0}),"a");function o(r,t){if(!(r in globalThis))try{globalThis[r]=t}catch{}}e(o,"e"),u(o,"polyfill"),o("fetch",l),o("Blob",m),o("File",p),o("FormData",a),o("Headers",n),o("Request",s),o("Response",b),o("AbortController",f);