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/mdast-util-to-hast/lib/handlers/image-reference.js

@@ -0,0 +1,39 @@
+/**
+ * @import {ElementContent, Element, Properties} from 'hast'
+ * @import {ImageReference} from 'mdast'
+ * @import {State} from '../state.js'
+ */
+
+import {normalizeUri} from 'micromark-util-sanitize-uri'
+import {revert} from '../revert.js'
+
+/**
+ * Turn an mdast `imageReference` node into hast.
+ *
+ * @param {State} state
+ *   Info passed around.
+ * @param {ImageReference} node
+ *   mdast node.
+ * @returns {Array<ElementContent> | ElementContent}
+ *   hast node.
+ */
+export function imageReference(state, node) {
+  const id = String(node.identifier).toUpperCase()
+  const definition = state.definitionById.get(id)
+
+  if (!definition) {
+    return revert(state, node)
+  }
+
+  /** @type {Properties} */
+  const properties = {src: normalizeUri(definition.url || ''), alt: node.alt}
+
+  if (definition.title !== null && definition.title !== undefined) {
+    properties.title = definition.title
+  }
+
+  /** @type {Element} */
+  const result = {type: 'element', tagName: 'img', properties, children: []}
+  state.patch(node, result)
+  return state.applyData(node, result)
+}