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-markdown/lib/handle/image-reference.js

@@ -0,0 +1,63 @@
+/**
+ * @import {Info, State} from 'mdast-util-to-markdown'
+ * @import {ImageReference, Parents} from 'mdast'
+ */
+
+imageReference.peek = imageReferencePeek
+
+/**
+ * @param {ImageReference} node
+ * @param {Parents | undefined} _
+ * @param {State} state
+ * @param {Info} info
+ * @returns {string}
+ */
+export function imageReference(node, _, state, info) {
+  const type = node.referenceType
+  const exit = state.enter('imageReference')
+  let subexit = state.enter('label')
+  const tracker = state.createTracker(info)
+  let value = tracker.move('![')
+  const alt = state.safe(node.alt, {
+    before: value,
+    after: ']',
+    ...tracker.current()
+  })
+  value += tracker.move(alt + '][')
+
+  subexit()
+  // Hide the fact that we’re in phrasing, because escapes don’t work.
+  const stack = state.stack
+  state.stack = []
+  subexit = state.enter('reference')
+  // Note: for proper tracking, we should reset the output positions when we end
+  // up making a `shortcut` reference, because then there is no brace output.
+  // Practically, in that case, there is no content, so it doesn’t matter that
+  // we’ve tracked one too many characters.
+  const reference = state.safe(state.associationId(node), {
+    before: value,
+    after: ']',
+    ...tracker.current()
+  })
+  subexit()
+  state.stack = stack
+  exit()
+
+  if (type === 'full' || !alt || alt !== reference) {
+    value += tracker.move(reference + ']')
+  } else if (type === 'shortcut') {
+    // Remove the unwanted `[`.
+    value = value.slice(0, -1)
+  } else {
+    value += tracker.move(']')
+  }
+
+  return value
+}
+
+/**
+ * @returns {string}
+ */
+function imageReferencePeek() {
+  return '!'
+}