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/nlcst-to-string/lib/index.js

@@ -0,0 +1,38 @@
+/**
+ * @typedef {import('nlcst').Nodes} Nodes
+ */
+
+/** @type {Readonly<Array<Nodes>>} */
+const emptyNodes = []
+
+/**
+ * Get the text content of a node or list of nodes.
+ *
+ * Prefers the node’s plain-text fields, otherwise serializes its children, and
+ * if the given value is an array, serialize the nodes in it.
+ *
+ * @param {Array<Nodes> | Nodes} value
+ *   Node or list of nodes to serialize.
+ * @returns {string}
+ *   Result.
+ */
+export function toString(value) {
+  let index = -1
+
+  if (!value || (!Array.isArray(value) && !value.type)) {
+    throw new Error('Expected node, not `' + value + '`')
+  }
+
+  if ('value' in value) return value.value
+
+  const children = (Array.isArray(value) ? value : value.children) || emptyNodes
+
+  /** @type {Array<string>} */
+  const values = []
+
+  while (++index < children.length) {
+    values[index] = toString(children[index])
+  }
+
+  return values.join('')
+}