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/browser/Browser.d.ts

@@ -0,0 +1,60 @@
+import IBrowserSettings from './types/IBrowserSettings.js';
+import BrowserContext from './BrowserContext.js';
+import IOptionalBrowserSettings from './types/IOptionalBrowserSettings.js';
+import BrowserPage from './BrowserPage.js';
+import IBrowser from './types/IBrowser.js';
+import BrowserExceptionObserver from './utilities/BrowserExceptionObserver.js';
+import * as PropertySymbol from '../PropertySymbol.js';
+/**
+ * Browser.
+ */
+export default class Browser implements IBrowser {
+    readonly contexts: BrowserContext[];
+    readonly settings: IBrowserSettings;
+    readonly console: Console | null;
+    [PropertySymbol.exceptionObserver]: BrowserExceptionObserver | null;
+    /**
+     * Constructor.
+     *
+     * @param [options] Options.
+     * @param [options.settings] Browser settings.
+     * @param [options.console] Console.
+     */
+    constructor(options?: {
+        settings?: IOptionalBrowserSettings;
+        console?: Console;
+    });
+    /**
+     * Returns the default context.
+     *
+     * @returns Default context.
+     */
+    get defaultContext(): BrowserContext;
+    /**
+     * Aborts all ongoing operations and destroys the browser.
+     */
+    close(): Promise<void>;
+    /**
+     * Returns a promise that is resolved when all resources has been loaded, fetch has completed, and all async tasks such as timers are complete.
+     *
+     * @returns Promise.
+     */
+    waitUntilComplete(): Promise<void>;
+    /**
+     * Aborts all ongoing operations.
+     */
+    abort(): Promise<void>;
+    /**
+     * Creates a new incognito context.
+     *
+     * @returns Context.
+     */
+    newIncognitoContext(): BrowserContext;
+    /**
+     * Creates a new page.
+     *
+     * @returns Page.
+     */
+    newPage(): BrowserPage;
+}
+//# sourceMappingURL=Browser.d.ts.map