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/dom-parser/DOMParser.d.ts

@@ -0,0 +1,21 @@
+import Document from '../nodes/document/Document.js';
+import * as PropertySymbol from '../PropertySymbol.js';
+import BrowserWindow from '../window/BrowserWindow.js';
+/**
+ * DOM parser.
+ *
+ * Reference:
+ * https://developer.mozilla.org/en-US/docs/Web/API/DOMParser.
+ */
+export default class DOMParser {
+    protected [PropertySymbol.window]: BrowserWindow;
+    /**
+     * Parses HTML and returns a root element.
+     *
+     * @param string HTML data.
+     * @param mimeType Mime type.
+     * @returns Root element.
+     */
+    parseFromString(string: string, mimeType: string): Document;
+}
+//# sourceMappingURL=DOMParser.d.ts.map

frontend/node_modules/happy-dom/lib/dom-parser/DOMParser.d.ts.map

@@ -0,0 +1 @@
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frontend/node_modules/happy-dom/lib/dom-parser/DOMParser.js

@@ -0,0 +1,38 @@
+import * as PropertySymbol from '../PropertySymbol.js';
+import XMLParser from '../xml-parser/XMLParser.js';
+import HTMLParser from '../html-parser/HTMLParser.js';
+/**
+ * DOM parser.
+ *
+ * Reference:
+ * https://developer.mozilla.org/en-US/docs/Web/API/DOMParser.
+ */
+export default class DOMParser {
+    /**
+     * Parses HTML and returns a root element.
+     *
+     * @param string HTML data.
+     * @param mimeType Mime type.
+     * @returns Root element.
+     */
+    parseFromString(string, mimeType) {
+        if (!mimeType) {
+            throw new this[PropertySymbol.window].DOMException('Second parameter "mimeType" is mandatory.');
+        }
+        const window = this[PropertySymbol.window];
+        switch (mimeType) {
+            case 'text/html':
+                const newDocument = new window.HTMLDocument();
+                newDocument[PropertySymbol.defaultView] = window;
+                return new HTMLParser(this[PropertySymbol.window]).parse(string, newDocument);
+            case 'image/svg+xml':
+            case 'text/xml':
+            case 'application/xml':
+            case 'application/xhtml+xml':
+                return new XMLParser(this[PropertySymbol.window]).parse(string);
+            default:
+                throw new window.DOMException(`Unknown mime type "${mimeType}".`);
+        }
+    }
+}
+//# sourceMappingURL=DOMParser.js.map

frontend/node_modules/happy-dom/lib/dom-parser/DOMParser.js.map

@@ -0,0 +1 @@
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