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-style-element/SVGStyleElement.js

@@ -0,0 +1,110 @@
+import * as PropertySymbol from '../../PropertySymbol.js';
+import SVGElement from '../svg-element/SVGElement.js';
+/**
+ * SVG Style Element.
+ *
+ * @see https://developer.mozilla.org/en-US/docs/Web/API/SVGStyleElement
+ */
+export default class SVGStyleElement extends SVGElement {
+    // Internal properties
+    [PropertySymbol.sheet] = null;
+    [PropertySymbol.styleNode] = this;
+    [PropertySymbol.disabled] = false;
+    /**
+     * Returns media.
+     *
+     * @returns Media.
+     */
+    get media() {
+        return this.getAttribute('media') || 'all';
+    }
+    /**
+     * Sets media.
+     *
+     * @param media Media.
+     */
+    set media(media) {
+        this.setAttribute('media', media);
+    }
+    /**
+     * Returns type.
+     *
+     * @deprecated
+     * @returns Type.
+     */
+    get type() {
+        return this.getAttribute('type') || 'text/css';
+    }
+    /**
+     * Sets type.
+     *
+     * @deprecated
+     * @param type Type.
+     */
+    set type(type) {
+        this.setAttribute('type', type);
+    }
+    /**
+     * Returns title.
+     *
+     * @returns Title.
+     */
+    get title() {
+        return this.getAttribute('title') || '';
+    }
+    /**
+     * Sets title.
+     *
+     * @param title Title.
+     */
+    set title(title) {
+        this.setAttribute('title', title);
+    }
+    /**
+     * Returns disabled.
+     *
+     * @returns Disabled.
+     */
+    get disabled() {
+        return this[PropertySymbol.disabled];
+    }
+    /**
+     * Sets disabled.
+     *
+     * @param disabled Disabled.
+     */
+    set disabled(disabled) {
+        this[PropertySymbol.disabled] = Boolean(disabled);
+    }
+    /**
+     * Returns style.
+     *
+     * @returns Style.
+     */
+    get sheet() {
+        if (!this[PropertySymbol.isConnected]) {
+            return null;
+        }
+        if (!this[PropertySymbol.sheet]) {
+            this[PropertySymbol.sheet] = new this[PropertySymbol.ownerDocument][PropertySymbol.window].CSSStyleSheet();
+            this[PropertySymbol.sheet].replaceSync(this.textContent);
+        }
+        return this[PropertySymbol.sheet];
+    }
+    /**
+     * @override
+     */
+    [PropertySymbol.disconnectedFromDocument]() {
+        super[PropertySymbol.disconnectedFromDocument]();
+        this[PropertySymbol.sheet] = null;
+    }
+    /**
+     * Updates the CSSStyleSheet with the text content.
+     */
+    [PropertySymbol.updateSheet]() {
+        if (this[PropertySymbol.sheet]) {
+            this[PropertySymbol.sheet].replaceSync(this.textContent);
+        }
+    }
+}
+//# sourceMappingURL=SVGStyleElement.js.map