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/astro/dist/i18n/fallback.d.ts

@@ -0,0 +1,46 @@
+import type { SSRManifest, SSRManifestI18n } from '../core/app/types.js';
+import type { APIContext } from '../types/public/context.js';
+/**
+ * Fallback routing decision types
+ */
+export type FallbackRouteResult = {
+    type: 'none';
+} | {
+    type: 'redirect';
+    pathname: string;
+} | {
+    type: 'rewrite';
+    pathname: string;
+};
+/**
+ * Options for computing fallback routes.
+ * Uses types from APIContext and SSRManifest to ensure type safety.
+ */
+export interface ComputeFallbackRouteOptions {
+    /** Pathname from url.pathname */
+    pathname: APIContext['url']['pathname'];
+    /** Response status code */
+    responseStatus: number;
+    /** Current locale from APIContext */
+    currentLocale: APIContext['currentLocale'];
+    /** Fallback configuration from i18n manifest */
+    fallback: NonNullable<SSRManifestI18n['fallback']>;
+    /** Fallback type from i18n manifest */
+    fallbackType: SSRManifestI18n['fallbackType'];
+    /** Locales from i18n manifest */
+    locales: SSRManifestI18n['locales'];
+    /** Default locale from i18n manifest */
+    defaultLocale: SSRManifestI18n['defaultLocale'];
+    /** Routing strategy from i18n manifest */
+    strategy: SSRManifestI18n['strategy'];
+    /** Base path from manifest */
+    base: SSRManifest['base'];
+}
+/**
+ * Compute fallback route for failed responses.
+ * Pure function - no APIContext, no Response objects, no URL objects.
+ *
+ * This function determines whether a failed request should be redirected or rewritten
+ * to a fallback locale based on the i18n configuration.
+ */
+export declare function computeFallbackRoute(options: ComputeFallbackRouteOptions): FallbackRouteResult;