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/zwitch/index.js

@@ -0,0 +1,118 @@
+/**
+ * @callback Handler
+ *   Handle a value, with a certain ID field set to a certain value.
+ *   The ID field is passed to `zwitch`, and it’s value is this function’s
+ *   place on the `handlers` record.
+ * @param {...any} parameters
+ *   Arbitrary parameters passed to the zwitch.
+ *   The first will be an object with a certain ID field set to a certain value.
+ * @returns {any}
+ *   Anything!
+ */
+
+/**
+ * @callback UnknownHandler
+ *   Handle values that do have a certain ID field, but it’s set to a value
+ *   that is not listed in the `handlers` record.
+ * @param {unknown} value
+ *   An object with a certain ID field set to an unknown value.
+ * @param {...any} rest
+ *   Arbitrary parameters passed to the zwitch.
+ * @returns {any}
+ *   Anything!
+ */
+
+/**
+ * @callback InvalidHandler
+ *   Handle values that do not have a certain ID field.
+ * @param {unknown} value
+ *   Any unknown value.
+ * @param {...any} rest
+ *   Arbitrary parameters passed to the zwitch.
+ * @returns {void|null|undefined|never}
+ *   This should crash or return nothing.
+ */
+
+/**
+ * @template {InvalidHandler} [Invalid=InvalidHandler]
+ * @template {UnknownHandler} [Unknown=UnknownHandler]
+ * @template {Record<string, Handler>} [Handlers=Record<string, Handler>]
+ * @typedef Options
+ *   Configuration (required).
+ * @property {Invalid} [invalid]
+ *   Handler to use for invalid values.
+ * @property {Unknown} [unknown]
+ *   Handler to use for unknown values.
+ * @property {Handlers} [handlers]
+ *   Handlers to use.
+ */
+
+const own = {}.hasOwnProperty
+
+/**
+ * Handle values based on a field.
+ *
+ * @template {InvalidHandler} [Invalid=InvalidHandler]
+ * @template {UnknownHandler} [Unknown=UnknownHandler]
+ * @template {Record<string, Handler>} [Handlers=Record<string, Handler>]
+ * @param {string} key
+ *   Field to switch on.
+ * @param {Options<Invalid, Unknown, Handlers>} [options]
+ *   Configuration (required).
+ * @returns {{unknown: Unknown, invalid: Invalid, handlers: Handlers, (...parameters: Parameters<Handlers[keyof Handlers]>): ReturnType<Handlers[keyof Handlers]>, (...parameters: Parameters<Unknown>): ReturnType<Unknown>}}
+ */
+export function zwitch(key, options) {
+  const settings = options || {}
+
+  /**
+   * Handle one value.
+   *
+   * Based on the bound `key`, a respective handler will be called.
+   * If `value` is not an object, or doesn’t have a `key` property, the special
+   * “invalid” handler will be called.
+   * If `value` has an unknown `key`, the special “unknown” handler will be
+   * called.
+   *
+   * All arguments, and the context object, are passed through to the handler,
+   * and it’s result is returned.
+   *
+   * @this {unknown}
+   *   Any context object.
+   * @param {unknown} [value]
+   *   Any value.
+   * @param {...unknown} parameters
+   *   Arbitrary parameters passed to the zwitch.
+   * @property {Handler} invalid
+   *   Handle for values that do not have a certain ID field.
+   * @property {Handler} unknown
+   *   Handle values that do have a certain ID field, but it’s set to a value
+   *   that is not listed in the `handlers` record.
+   * @property {Handlers} handlers
+   *   Record of handlers.
+   * @returns {unknown}
+   *   Anything.
+   */
+  function one(value, ...parameters) {
+    /** @type {Handler|undefined} */
+    let fn = one.invalid
+    const handlers = one.handlers
+
+    if (value && own.call(value, key)) {
+      // @ts-expect-error Indexable.
+      const id = String(value[key])
+      // @ts-expect-error Indexable.
+      fn = own.call(handlers, id) ? handlers[id] : one.unknown
+    }
+
+    if (fn) {
+      return fn.call(this, value, ...parameters)
+    }
+  }
+
+  one.handlers = settings.handlers || {}
+  one.invalid = settings.invalid
+  one.unknown = settings.unknown
+
+  // @ts-expect-error: matches!
+  return one
+}