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/match-braces/prism-match-braces.min.css

@@ -0,0 +1 @@
+.token.punctuation.brace-hover,.token.punctuation.brace-selected{outline:solid 1px}.rainbow-braces .token.punctuation.brace-level-1,.rainbow-braces .token.punctuation.brace-level-5,.rainbow-braces .token.punctuation.brace-level-9{color:#e50;opacity:1}.rainbow-braces .token.punctuation.brace-level-10,.rainbow-braces .token.punctuation.brace-level-2,.rainbow-braces .token.punctuation.brace-level-6{color:#0b3;opacity:1}.rainbow-braces .token.punctuation.brace-level-11,.rainbow-braces .token.punctuation.brace-level-3,.rainbow-braces .token.punctuation.brace-level-7{color:#26f;opacity:1}.rainbow-braces .token.punctuation.brace-level-12,.rainbow-braces .token.punctuation.brace-level-4,.rainbow-braces .token.punctuation.brace-level-8{color:#e0e;opacity:1}