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/unstorage/drivers/overlay.mjs

@@ -0,0 +1,68 @@
+import { defineDriver } from "./utils/index.mjs";
+import { normalizeKey } from "./utils/index.mjs";
+const OVERLAY_REMOVED = "__OVERLAY_REMOVED__";
+const DRIVER_NAME = "overlay";
+export default defineDriver((options) => {
+  return {
+    name: DRIVER_NAME,
+    options,
+    async hasItem(key, opts) {
+      for (const layer of options.layers) {
+        if (await layer.hasItem(key, opts)) {
+          if (layer === options.layers[0] && await options.layers[0]?.getItem(key) === OVERLAY_REMOVED) {
+            return false;
+          }
+          return true;
+        }
+      }
+      return false;
+    },
+    async getItem(key) {
+      for (const layer of options.layers) {
+        const value = await layer.getItem(key);
+        if (value === OVERLAY_REMOVED) {
+          return null;
+        }
+        if (value !== null) {
+          return value;
+        }
+      }
+      return null;
+    },
+    // TODO: Support native meta
+    // async getMeta (key) {},
+    async setItem(key, value, opts) {
+      await options.layers[0]?.setItem?.(key, value, opts);
+    },
+    async removeItem(key, opts) {
+      await options.layers[0]?.setItem?.(key, OVERLAY_REMOVED, opts);
+    },
+    async getKeys(base, opts) {
+      const allKeys = await Promise.all(
+        options.layers.map(async (layer) => {
+          const keys = await layer.getKeys(base, opts);
+          return keys.map((key) => normalizeKey(key));
+        })
+      );
+      const uniqueKeys = [...new Set(allKeys.flat())];
+      const existingKeys = await Promise.all(
+        uniqueKeys.map(async (key) => {
+          if (await options.layers[0]?.getItem(key) === OVERLAY_REMOVED) {
+            return false;
+          }
+          return key;
+        })
+      );
+      return existingKeys.filter(Boolean);
+    },
+    async dispose() {
+      await Promise.all(
+        options.layers.map(async (layer) => {
+          if (layer.dispose) {
+            await layer.dispose();
+          }
+        })
+      );
+    }
+  };
+});