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-title-element/HTMLTitleElement.js

@@ -0,0 +1,45 @@
+import HTMLElement from '../html-element/HTMLElement.js';
+import NodeTypeEnum from '../node/NodeTypeEnum.js';
+import * as PropertySymbol from '../../PropertySymbol.js';
+/**
+ * HTMLTitleElement
+ *
+ * @see https://developer.mozilla.org/en-US/docs/Web/API/HTMLTitleElement
+ */
+export default class HTMLTitleElement extends HTMLElement {
+    /**
+     * Returns text.
+     *
+     * @returns Text.
+     */
+    get text() {
+        let text = '';
+        for (const child of this[PropertySymbol.nodeArray]) {
+            if (child[PropertySymbol.nodeType] === NodeTypeEnum.textNode) {
+                text += child.textContent;
+            }
+        }
+        return text;
+    }
+    /**
+     * Sets text.
+     *
+     * @param text Text.
+     */
+    set text(text) {
+        this.textContent = text;
+    }
+    /**
+     * @override
+     */
+    get innerHTML() {
+        return this.getHTML();
+    }
+    /**
+     * @override
+     */
+    set innerHTML(html) {
+        this.textContent = html;
+    }
+}
+//# sourceMappingURL=HTMLTitleElement.js.map