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/text/Text.d.ts

@@ -0,0 +1,55 @@
+import * as PropertySymbol from '../../PropertySymbol.js';
+import CharacterData from '../character-data/CharacterData.js';
+import HTMLTextAreaElement from '../html-text-area-element/HTMLTextAreaElement.js';
+import NodeTypeEnum from '../node/NodeTypeEnum.js';
+import HTMLStyleElement from '../html-style-element/HTMLStyleElement.js';
+/**
+ * Text node.
+ */
+export default class Text extends CharacterData {
+    cloneNode: (deep?: boolean) => Text;
+    [PropertySymbol.nodeType]: NodeTypeEnum;
+    [PropertySymbol.textAreaNode]: HTMLTextAreaElement | null;
+    [PropertySymbol.styleNode]: HTMLStyleElement | null;
+    /**
+     * Node name.
+     *
+     * @returns Node name.
+     */
+    get nodeName(): string;
+    /**
+     * @override
+     */
+    get data(): string;
+    /**
+     * @override
+     */
+    set data(data: string);
+    /**
+     * Breaks the Text node into two nodes at the specified offset, keeping both nodes in the tree as siblings.
+     *
+     * @see https://dom.spec.whatwg.org/#dom-text-splittext
+     * @param offset Offset.
+     * @returns New text node.
+     */
+    splitText(offset: number): Text;
+    /**
+     * Converts to string.
+     *
+     * @returns String.
+     */
+    toString(): string;
+    /**
+     * @override
+     */
+    [PropertySymbol.cloneNode](deep?: boolean): Text;
+    /**
+     * @override
+     */
+    [PropertySymbol.connectedToNode](): void;
+    /**
+     * @override
+     */
+    [PropertySymbol.disconnectedFromNode](): void;
+}
+//# sourceMappingURL=Text.d.ts.map