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.d.ts

@@ -0,0 +1,24 @@
+import Document from '../nodes/document/Document.js';
+import Node from './node/Node.js';
+/**
+ * Node factory used for setting the owner document to nodes.
+ */
+export default class NodeFactory {
+    static ownerDocuments: Document[];
+    /**
+     * 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<T extends Node>(ownerDocument: Document, nodeClass: new (...args: any[]) => T, ...args: any[]): T;
+    /**
+     * Pulls an owner document from the queue.
+     *
+     * @returns Document.
+     */
+    static pullOwnerDocument(): Document;
+}
+//# sourceMappingURL=NodeFactory.d.ts.map