refactor: remove electron-related code

src/components/PostDialog/Preview.tsx

@@ -0,0 +1,21 @@
+import { Card } from '@/components/ui/card'
+import dayjs from 'dayjs'
+import Content from '../Content'
+
+export default function Preview({ content }: { content: string }) {
+  return (
+    <Card className="p-3">
+      <Content
+        event={{
+          content,
+          kind: 1,
+          tags: [],
+          created_at: dayjs().unix(),
+          id: '',
+          pubkey: '',
+          sig: ''
+        }}
+      />
+    </Card>
+  )
+}