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/util/track.js

@@ -0,0 +1,55 @@
+/**
+ * @import {CreateTracker, TrackCurrent, TrackMove, TrackShift} from '../types.js'
+ */
+
+/**
+ * Track positional info in the output.
+ *
+ * @type {CreateTracker}
+ */
+export function track(config) {
+  // Defaults are used to prevent crashes when older utilities somehow activate
+  // this code.
+  /* c8 ignore next 5 */
+  const options = config || {}
+  const now = options.now || {}
+  let lineShift = options.lineShift || 0
+  let line = now.line || 1
+  let column = now.column || 1
+
+  return {move, current, shift}
+
+  /**
+   * Get the current tracked info.
+   *
+   * @type {TrackCurrent}
+   */
+  function current() {
+    return {now: {line, column}, lineShift}
+  }
+
+  /**
+   * Define an increased line shift (the typical indent for lines).
+   *
+   * @type {TrackShift}
+   */
+  function shift(value) {
+    lineShift += value
+  }
+
+  /**
+   * Move past some generated markdown.
+   *
+   * @type {TrackMove}
+   */
+  function move(input) {
+    // eslint-disable-next-line unicorn/prefer-default-parameters
+    const value = input || ''
+    const chunks = value.split(/\r?\n|\r/g)
+    const tail = chunks[chunks.length - 1]
+    line += chunks.length - 1
+    column =
+      chunks.length === 1 ? column + tail.length : 1 + tail.length + lineShift
+    return value
+  }
+}