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/cjs/nodes/html-audio-element/Audio.d.ts

@@ -0,0 +1,20 @@
+import HTMLAudioElement from './HTMLAudioElement.cjs';
+import * as PropertySymbol from '../../PropertySymbol.cjs';
+/**
+ * Image as constructor.
+ *
+ * Reference:
+ * https://developer.mozilla.org/en-US/docs/Web/API/HTMLAudioElement/Audio.
+ */
+export default class Audio extends HTMLAudioElement {
+    [PropertySymbol.tagName]: string;
+    [PropertySymbol.localName]: string;
+    [PropertySymbol.namespaceURI]: string;
+    /**
+     * Constructor.
+     *
+     * @param [url] source URL.
+     */
+    constructor(url?: string);
+}
+//# sourceMappingURL=Audio.d.ts.map