feat: add widget preview pages (#9)

* feat: add widget definition system

* fix: wrong typecheck command in turbo generator

* chore: fix formatting

* feat: add widget preview page

* chore: fix formatting and type errors

* chore: fix from widget edit modal and remove some never casts

* chore: address pull request feedback

apps/nextjs/src/app/[locale]/(main)/layout.tsx

@@ -0,0 +1,15 @@
+import type { PropsWithChildren } from "react";
+
+import { AppShellMain } from "@homarr/ui";
+
+import { MainHeader } from "~/components/layout/header";
+import { ClientShell } from "~/components/layout/shell";
+
+export default function MainLayout({ children }: PropsWithChildren) {
+  return (
+    <ClientShell hasNavigation={false}>
+      <MainHeader />
+      <AppShellMain>{children}</AppShellMain>
+    </ClientShell>
+  );
+}

apps/nextjs/src/app/[locale]/(main)/page.tsx

@@ -0,0 +1,9 @@
+import { Stack, Title } from "@homarr/ui";
+
+export default function HomePage() {
+  return (
+    <Stack>
+      <Title>Home</Title>
+    </Stack>
+  );
+}