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/code.js

@@ -0,0 +1,75 @@
+/**
+ * @import {Info, Map, State} from 'mdast-util-to-markdown'
+ * @import {Code, Parents} from 'mdast'
+ */
+
+import {longestStreak} from 'longest-streak'
+import {formatCodeAsIndented} from '../util/format-code-as-indented.js'
+import {checkFence} from '../util/check-fence.js'
+
+/**
+ * @param {Code} node
+ * @param {Parents | undefined} _
+ * @param {State} state
+ * @param {Info} info
+ * @returns {string}
+ */
+export function code(node, _, state, info) {
+  const marker = checkFence(state)
+  const raw = node.value || ''
+  const suffix = marker === '`' ? 'GraveAccent' : 'Tilde'
+
+  if (formatCodeAsIndented(node, state)) {
+    const exit = state.enter('codeIndented')
+    const value = state.indentLines(raw, map)
+    exit()
+    return value
+  }
+
+  const tracker = state.createTracker(info)
+  const sequence = marker.repeat(Math.max(longestStreak(raw, marker) + 1, 3))
+  const exit = state.enter('codeFenced')
+  let value = tracker.move(sequence)
+
+  if (node.lang) {
+    const subexit = state.enter(`codeFencedLang${suffix}`)
+    value += tracker.move(
+      state.safe(node.lang, {
+        before: value,
+        after: ' ',
+        encode: ['`'],
+        ...tracker.current()
+      })
+    )
+    subexit()
+  }
+
+  if (node.lang && node.meta) {
+    const subexit = state.enter(`codeFencedMeta${suffix}`)
+    value += tracker.move(' ')
+    value += tracker.move(
+      state.safe(node.meta, {
+        before: value,
+        after: '\n',
+        encode: ['`'],
+        ...tracker.current()
+      })
+    )
+    subexit()
+  }
+
+  value += tracker.move('\n')
+
+  if (raw) {
+    value += tracker.move(raw + '\n')
+  }
+
+  value += tracker.move(sequence)
+  exit()
+  return value
+}
+
+/** @type {Map} */
+function map(line, _, blank) {
+  return (blank ? '' : '    ') + line
+}