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/html-document/HTMLDocument.d.ts

@@ -0,0 +1,21 @@
+import Document from '../document/Document.js';
+import * as PropertySymbol from '../../PropertySymbol.js';
+import Node from '../node/Node.js';
+/**
+ * Document.
+ */
+export default class HTMLDocument extends Document {
+    /**
+     * Constructor.
+     */
+    constructor();
+    /**
+     * @override
+     */
+    [PropertySymbol.appendChild](node: Node, disableValidations?: boolean): Node;
+    /**
+     * @override
+     */
+    [PropertySymbol.insertBefore](newNode: Node, referenceNode: Node | null, disableValidations?: boolean): Node;
+}
+//# sourceMappingURL=HTMLDocument.d.ts.map

frontend/node_modules/happy-dom/lib/nodes/html-document/HTMLDocument.d.ts.map

@@ -0,0 +1 @@
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frontend/node_modules/happy-dom/lib/nodes/html-document/HTMLDocument.js

@@ -0,0 +1,54 @@
+import Document from '../document/Document.js';
+import * as PropertySymbol from '../../PropertySymbol.js';
+import NodeTypeEnum from '../node/NodeTypeEnum.js';
+/**
+ * Document.
+ */
+export default class HTMLDocument extends Document {
+    /**
+     * Constructor.
+     */
+    constructor() {
+        super();
+        // Default document elements
+        const documentElement = this.createElement('html');
+        const bodyElement = this.createElement('body');
+        const headElement = this.createElement('head');
+        this.appendChild(documentElement);
+        documentElement.appendChild(headElement);
+        documentElement.appendChild(bodyElement);
+    }
+    /**
+     * @override
+     */
+    [PropertySymbol.appendChild](node, disableValidations = false) {
+        if (node[PropertySymbol.nodeType] === NodeTypeEnum.textNode) {
+            throw new this[PropertySymbol.window].Error(`Failed to execute 'appendChild' on 'Node': Nodes of type '#text' may not be inserted inside nodes of type '#document'.`);
+        }
+        if (node[PropertySymbol.nodeType] === NodeTypeEnum.documentFragmentNode) {
+            return;
+        }
+        if (node[PropertySymbol.nodeType] === NodeTypeEnum.elementNode &&
+            this[PropertySymbol.elementArray].length !== 0) {
+            throw new this[PropertySymbol.window].Error(`Failed to execute 'appendChild' on 'Node': Only one element on document allowed.`);
+        }
+        return super[PropertySymbol.appendChild](node, disableValidations);
+    }
+    /**
+     * @override
+     */
+    [PropertySymbol.insertBefore](newNode, referenceNode, disableValidations = false) {
+        if (newNode[PropertySymbol.nodeType] === NodeTypeEnum.textNode) {
+            throw new this[PropertySymbol.window].Error(`Failed to execute 'insertBefore' on 'Node': Nodes of type '#text' may not be inserted inside nodes of type '#document'.`);
+        }
+        if (newNode[PropertySymbol.nodeType] === NodeTypeEnum.documentFragmentNode) {
+            return;
+        }
+        if (newNode[PropertySymbol.nodeType] === NodeTypeEnum.elementNode &&
+            this[PropertySymbol.elementArray].length !== 0) {
+            throw new this[PropertySymbol.window].Error(`Failed to execute 'insertBefore' on 'Node': Only one element on document allowed.`);
+        }
+        return super[PropertySymbol.insertBefore](newNode, referenceNode, disableValidations);
+    }
+}
+//# sourceMappingURL=HTMLDocument.js.map

frontend/node_modules/happy-dom/lib/nodes/html-document/HTMLDocument.js.map

@@ -0,0 +1 @@
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