feat: 优化页面保护逻辑，提取 guarded page 检查函数

src/routes/+layout.ts

@@ -11,11 +11,15 @@ import type { LayoutLoad } from "./$types";
 // See: https://v2.tauri.app/start/frontend/sveltekit/ for more info
 export const ssr = false;
 
+function isGuardedPage(pathname: string) {
+  return !pathname.startsWith("/boot") && !pathname.startsWith("/settings") && !pathname.startsWith("/create");
+}
+
 export const load: LayoutLoad = async ({url}) => {
   const currentOpenedDataset = get(openedDatasetDir);
   console.debug('[Main Load]', currentOpenedDataset, url);
 
-  if (isNil(currentOpenedDataset) && url.pathname !== "/boot" && url.pathname !== "/settings") {
+  if (isNil(currentOpenedDataset) && isGuardedPage(url.pathname)) {
     redirect(303, "/boot");
   }
 }