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/fetch/utilities/FetchResponseHeaderUtility.cjs

@@ -0,0 +1,48 @@
+"use strict";
+var __importDefault = (this && this.__importDefault) || function (mod) {
+    return (mod && mod.__esModule) ? mod : { "default": mod };
+};
+Object.defineProperty(exports, "__esModule", { value: true });
+const CookieStringUtility_js_1 = __importDefault(require("../../cookie/urilities/CookieStringUtility.cjs"));
+const Headers_js_1 = __importDefault(require("../Headers.cjs"));
+/**
+ * Fetch request validation utility.
+ */
+class FetchResponseHeaderUtility {
+    /**
+     * Appends headers to response.
+     *
+     * @param nodeResponse HTTP request.
+     * @param options
+     * @param options.browserFrame
+     * @param options.requestURL
+     * @param options.rawHeaders
+     * @returns Headers.
+     */
+    static parseResponseHeaders(options) {
+        const headers = new Headers_js_1.default();
+        let key = null;
+        for (const header of options.rawHeaders) {
+            if (!key) {
+                key = header;
+            }
+            else {
+                const lowerName = key.toLowerCase();
+                // Handles setting cookie headers to the document.
+                // "Set-Cookie" and "Set-Cookie2" are not allowed in response headers according to spec.
+                if (lowerName === 'set-cookie' || lowerName === 'set-cookie2') {
+                    options.browserFrame.page.context.cookieContainer.addCookies([
+                        CookieStringUtility_js_1.default.stringToCookie(options.requestURL, header)
+                    ]);
+                }
+                else {
+                    headers.append(key, header);
+                }
+                key = null;
+            }
+        }
+        return headers;
+    }
+}
+exports.default = FetchResponseHeaderUtility;
+//# sourceMappingURL=FetchResponseHeaderUtility.cjs.map