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/svg-radial-gradient-element/SVGRadialGradientElement.d.ts

@@ -0,0 +1,46 @@
+import * as PropertySymbol from '../../PropertySymbol.js';
+import SVGAnimatedLength from '../../svg/SVGAnimatedLength.js';
+import SVGGradientElement from '../svg-gradient-element/SVGGradientElement.js';
+/**
+ * SVG Radial Gradient Element.
+ *
+ * @see https://developer.mozilla.org/en-US/docs/Web/API/SVGRadialGradientElement
+ */
+export default class SVGRadialGradientElement extends SVGGradientElement {
+    [PropertySymbol.cx]: SVGAnimatedLength | null;
+    [PropertySymbol.cy]: SVGAnimatedLength | null;
+    [PropertySymbol.r]: SVGAnimatedLength | null;
+    [PropertySymbol.fx]: SVGAnimatedLength | null;
+    [PropertySymbol.fy]: SVGAnimatedLength | null;
+    /**
+     * Returns cx.
+     *
+     * @returns Cx.
+     */
+    get cx(): SVGAnimatedLength;
+    /**
+     * Returns cy.
+     *
+     * @returns Cy.
+     */
+    get cy(): SVGAnimatedLength;
+    /**
+     * Returns r.
+     *
+     * @returns R.
+     */
+    get r(): SVGAnimatedLength;
+    /**
+     * Returns fx.
+     *
+     * @returns Fx.
+     */
+    get fx(): SVGAnimatedLength;
+    /**
+     * Returns fy.
+     *
+     * @returns Fy.
+     */
+    get fy(): SVGAnimatedLength;
+}
+//# sourceMappingURL=SVGRadialGradientElement.d.ts.map