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/xml-document/XMLDocument.d.ts

@@ -0,0 +1,9 @@
+import Document from '../document/Document.js';
+import * as PropertySymbol from '../../PropertySymbol.js';
+/**
+ * Document.
+ */
+export default class XMLDocument extends Document {
+    [PropertySymbol.contentType]: string;
+}
+//# sourceMappingURL=XMLDocument.d.ts.map

frontend/node_modules/happy-dom/lib/nodes/xml-document/XMLDocument.d.ts.map

@@ -0,0 +1 @@
+{"version":3,"file":"XMLDocument.d.ts","sourceRoot":"","sources":["../../../src/nodes/xml-document/XMLDocument.ts"],"names":[],"mappings":"AAAA,OAAO,QAAQ,MAAM,yBAAyB,CAAC;AAC/C,OAAO,KAAK,cAAc,MAAM,yBAAyB,CAAC;AAE1D;;GAEG;AACH,MAAM,CAAC,OAAO,OAAO,WAAY,SAAQ,QAAQ;IAEzC,CAAC,cAAc,CAAC,WAAW,CAAC,EAAE,MAAM,CAAqB;CAChE"}

frontend/node_modules/happy-dom/lib/nodes/xml-document/XMLDocument.js

@@ -0,0 +1,10 @@
+import Document from '../document/Document.js';
+import * as PropertySymbol from '../../PropertySymbol.js';
+/**
+ * Document.
+ */
+export default class XMLDocument extends Document {
+    // Internal properties
+    [PropertySymbol.contentType] = 'application/xml';
+}
+//# sourceMappingURL=XMLDocument.js.map

frontend/node_modules/happy-dom/lib/nodes/xml-document/XMLDocument.js.map

@@ -0,0 +1 @@
+{"version":3,"file":"XMLDocument.js","sourceRoot":"","sources":["../../../src/nodes/xml-document/XMLDocument.ts"],"names":[],"mappings":"AAAA,OAAO,QAAQ,MAAM,yBAAyB,CAAC;AAC/C,OAAO,KAAK,cAAc,MAAM,yBAAyB,CAAC;AAE1D;;GAEG;AACH,MAAM,CAAC,OAAO,OAAO,WAAY,SAAQ,QAAQ;IAChD,sBAAsB;IACf,CAAC,cAAc,CAAC,WAAW,CAAC,GAAW,iBAAiB,CAAC;CAChE"}