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/prismjs/plugins/line-highlight/prism-line-highlight.min.css

@@ -0,0 +1 @@
+pre[data-line]{position:relative;padding:1em 0 1em 3em}.line-highlight{position:absolute;left:0;right:0;padding:inherit 0;margin-top:1em;background:hsla(24,20%,50%,.08);background:linear-gradient(to right,hsla(24,20%,50%,.1) 70%,hsla(24,20%,50%,0));pointer-events:none;line-height:inherit;white-space:pre}@media print{.line-highlight{-webkit-print-color-adjust:exact;color-adjust:exact}}.line-highlight:before,.line-highlight[data-end]:after{content:attr(data-start);position:absolute;top:.4em;left:.6em;min-width:1em;padding:0 .5em;background-color:hsla(24,20%,50%,.4);color:#f4f1ef;font:bold 65%/1.5 sans-serif;text-align:center;vertical-align:.3em;border-radius:999px;text-shadow:none;box-shadow:0 1px #fff}.line-highlight[data-end]:after{content:attr(data-end);top:auto;bottom:.4em}.line-numbers .line-highlight:after,.line-numbers .line-highlight:before{content:none}pre[id].linkable-line-numbers span.line-numbers-rows{pointer-events:all}pre[id].linkable-line-numbers span.line-numbers-rows>span:before{cursor:pointer}pre[id].linkable-line-numbers span.line-numbers-rows>span:hover:before{background-color:rgba(128,128,128,.2)}