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-stop-element/SVGStopElement.js

@@ -0,0 +1,27 @@
+import * as PropertySymbol from '../../PropertySymbol.js';
+import SVGAnimatedNumber from '../../svg/SVGAnimatedNumber.js';
+import SVGElement from '../svg-element/SVGElement.js';
+/**
+ * SVG Stop Element.
+ *
+ * @see https://developer.mozilla.org/en-US/docs/Web/API/SVGStopElement
+ */
+export default class SVGStopElement extends SVGElement {
+    // Internal properties
+    [PropertySymbol.offset] = null;
+    /**
+     * Returns offset.
+     *
+     * @returns Offset.
+     */
+    get offset() {
+        if (!this[PropertySymbol.offset]) {
+            this[PropertySymbol.offset] = new SVGAnimatedNumber(PropertySymbol.illegalConstructor, this[PropertySymbol.window], {
+                getAttribute: () => this.getAttribute('offset'),
+                setAttribute: (value) => this.setAttribute('offset', value)
+            });
+        }
+        return this[PropertySymbol.offset];
+    }
+}
+//# sourceMappingURL=SVGStopElement.js.map