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-fe-merge-element/SVGFEMergeElement.d.ts

@@ -0,0 +1,47 @@
+import SVGElement from '../svg-element/SVGElement.js';
+import * as PropertySymbol from '../../PropertySymbol.js';
+import SVGAnimatedString from '../../svg/SVGAnimatedString.js';
+import SVGAnimatedLength from '../../svg/SVGAnimatedLength.js';
+/**
+ * SVGFEMergeElement.
+ *
+ * @see https://developer.mozilla.org/en-US/docs/Web/API/SVGFEMergeElement
+ */
+export default class SVGFEMergeElement extends SVGElement {
+    [PropertySymbol.height]: SVGAnimatedLength | null;
+    [PropertySymbol.result]: SVGAnimatedString | null;
+    [PropertySymbol.width]: SVGAnimatedLength | null;
+    [PropertySymbol.x]: SVGAnimatedLength | null;
+    [PropertySymbol.y]: SVGAnimatedLength | null;
+    /**
+     * Returns height.
+     *
+     * @returns Height.
+     */
+    get height(): SVGAnimatedLength;
+    /**
+     * Returns result.
+     *
+     * @returns Result.
+     */
+    get result(): SVGAnimatedString;
+    /**
+     * Returns width.
+     *
+     * @returns Width.
+     */
+    get width(): SVGAnimatedLength;
+    /**
+     * Returns x.
+     *
+     * @returns X.
+     */
+    get x(): SVGAnimatedLength;
+    /**
+     * Returns y.
+     *
+     * @returns Y.
+     */
+    get y(): SVGAnimatedLength;
+}
+//# sourceMappingURL=SVGFEMergeElement.d.ts.map