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-input-element/HTMLInputElementValueSanitizer.d.ts

@@ -0,0 +1,46 @@
+import HTMLInputElement from './HTMLInputElement.js';
+/**
+ * HTML input element value sanitizer.
+ */
+export default class HTMLInputElementValueSanitizer {
+    /**
+     * Sanitizes a value.
+     *
+     * @param input Input.
+     * @param value Value.
+     */
+    static sanitize(input: HTMLInputElement, value: string): string;
+    /**
+     * Checks if a value is within the boundaries of min and max.
+     *
+     * @param value
+     * @param min
+     * @param max
+     */
+    private static checkBoundaries;
+    /**
+     * Parses the month component of a date string.
+     *
+     * @param value
+     */
+    private static parseMonthComponent;
+    /**
+     * Returns the last ISO week of a year.
+     *
+     * @param year
+     */
+    private static lastIsoWeekOfYear;
+    /**
+     * Sanitizes a date string.
+     *
+     * @param value
+     */
+    private static sanitizeDate;
+    /**
+     * Sanitizes a time string.
+     *
+     * @param value
+     */
+    private static sanitizeTime;
+}
+//# sourceMappingURL=HTMLInputElementValueSanitizer.d.ts.map