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/html-label-element/HTMLLabelElementUtility.js

@@ -0,0 +1,35 @@
+import NodeList from '../node/NodeList.js';
+import * as PropertySymbol from '../../PropertySymbol.js';
+/**
+ * Utility for finding labels associated with a form element.
+ */
+export default class HTMLLabelElementUtility {
+    /**
+     * Returns label elements for a form element.
+     *
+     * @param element Element to get labels for.
+     * @returns Label elements.
+     */
+    static getAssociatedLabelElements(element) {
+        const id = element.id;
+        let labels;
+        if (id && element[PropertySymbol.isConnected]) {
+            const rootNode = element[PropertySymbol.rootNode] ||
+                element[PropertySymbol.ownerDocument];
+            labels = (rootNode.querySelectorAll(`label[for="${id}"]`)[PropertySymbol.items]);
+        }
+        else {
+            labels = [];
+        }
+        let parent = element[PropertySymbol.parentNode];
+        while (parent) {
+            if (parent['tagName'] === 'LABEL') {
+                labels.push(parent);
+                break;
+            }
+            parent = parent[PropertySymbol.parentNode];
+        }
+        return new NodeList(PropertySymbol.illegalConstructor, labels);
+    }
+}
+//# sourceMappingURL=HTMLLabelElementUtility.js.map