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/stringify-entities/lib/util/to-named.js

@@ -0,0 +1,57 @@
+import {characterEntitiesLegacy} from 'character-entities-legacy'
+import {characterEntitiesHtml4} from 'character-entities-html4'
+import {dangerous} from '../constant/dangerous.js'
+
+const own = {}.hasOwnProperty
+
+/**
+ * `characterEntitiesHtml4` but inverted.
+ *
+ * @type {Record<string, string>}
+ */
+const characters = {}
+
+/** @type {string} */
+let key
+
+for (key in characterEntitiesHtml4) {
+  if (own.call(characterEntitiesHtml4, key)) {
+    characters[characterEntitiesHtml4[key]] = key
+  }
+}
+
+const notAlphanumericRegex = /[^\dA-Za-z]/
+
+/**
+ * Configurable ways to encode characters as named references.
+ *
+ * @param {number} code
+ * @param {number} next
+ * @param {boolean|undefined} omit
+ * @param {boolean|undefined} attribute
+ * @returns {string}
+ */
+export function toNamed(code, next, omit, attribute) {
+  const character = String.fromCharCode(code)
+
+  if (own.call(characters, character)) {
+    const name = characters[character]
+    const value = '&' + name
+
+    if (
+      omit &&
+      characterEntitiesLegacy.includes(name) &&
+      !dangerous.includes(name) &&
+      (!attribute ||
+        (next &&
+          next !== 61 /* `=` */ &&
+          notAlphanumericRegex.test(String.fromCharCode(next))))
+    ) {
+      return value
+    }
+
+    return value + ';'
+  }
+
+  return ''
+}