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/event/events/ProgressEvent.d.ts

@@ -0,0 +1,18 @@
+import Event from '../Event.cjs';
+import IProgressEventInit from './IProgressEventInit.cjs';
+/**
+ *
+ */
+export default class ProgressEvent extends Event {
+    readonly lengthComputable: boolean;
+    readonly loaded: number;
+    readonly total: number;
+    /**
+     * Constructor.
+     *
+     * @param type Event type.
+     * @param [eventInit] Event init.
+     */
+    constructor(type: string, eventInit?: IProgressEventInit | null);
+}
+//# sourceMappingURL=ProgressEvent.d.ts.map