feat: Reinitialize frontend with SvelteKit and TypeScript

- Delete old Vite+Svelte frontend
- Initialize new SvelteKit project with TypeScript
- Configure Tailwind CSS v4 + DaisyUI
- Implement JWT authentication with auto-refresh
- Create login page with form validation (Zod)
- Add protected route guards
- Update Docker configuration for single-stage build
- Add E2E tests with Playwright (6/11 passing)
- Fix Svelte 5 reactivity with $state() runes

Known issues:
- 5 E2E tests failing (timing/async issues)
- Token refresh implementation needs debugging
- Validation error display timing

frontend/node_modules/happy-dom/lib/browser/utilities/BrowserFrameScriptEvaluator.js

@@ -0,0 +1,21 @@
+import { Script } from 'vm';
+/**
+ * Browser frame script evaluator.
+ */
+export default class BrowserFrameScriptEvaluator {
+    /**
+     * Evaluates code or a VM Script in the frame's context.
+     *
+     * @param frame Frame.
+     * @param script Script.
+     * @returns Result.
+     */
+    static evaluate(frame, script) {
+        if (!frame.window) {
+            throw new Error('The frame has been destroyed, the "window" property is not set.');
+        }
+        script = typeof script === 'string' ? new Script(script) : script;
+        return script.runInContext(frame.window);
+    }
+}
+//# sourceMappingURL=BrowserFrameScriptEvaluator.js.map