feat(frontend): update layout, UI components, stores, and API route

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

frontend/src/routes/api/[...path]/+server.ts

@@ -20,8 +20,8 @@ async function proxyRequest(request: Request, path: string) {
 		if (!['GET', 'HEAD'].includes(request.method)) {
 			const contentType = request.headers.get('content-type') || '';
 			if (contentType.includes('multipart/form-data')) {
-				body = request.body;
-				fetchOptions.duplex = 'half';
+				body = request.body as BodyInit;
+				(fetchOptions as Record<string, unknown>).duplex = 'half';
 			} else {
 				body = await request.text();
 			}