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/nodes/NodeFactory.js

@@ -0,0 +1,30 @@
+import * as PropertySymbol from '../PropertySymbol.js';
+/**
+ * Node factory used for setting the owner document to nodes.
+ */
+export default class NodeFactory {
+    static ownerDocuments = [];
+    /**
+     * Creates a node instance with the given owner document.
+     *
+     * @param ownerDocument Owner document.
+     * @param nodeClass Node class.
+     * @param [args] Node arguments.
+     * @returns Node instance.
+     */
+    static createNode(ownerDocument, nodeClass, ...args) {
+        if (!nodeClass.prototype[PropertySymbol.window]) {
+            this.ownerDocuments.push(ownerDocument);
+        }
+        return new nodeClass(...args);
+    }
+    /**
+     * Pulls an owner document from the queue.
+     *
+     * @returns Document.
+     */
+    static pullOwnerDocument() {
+        return this.ownerDocuments.pop();
+    }
+}
+//# sourceMappingURL=NodeFactory.js.map