feat: implement project management features with cover images and planning sections

- Add ProjectsClient component for managing projects with a grid and list view.
- Introduce project cover image functionality and related fields in the database.
- Create a new table for project planning sections with RLS policies for user access.
- Update global styles for scrollbar customization.
- Enhance Next.js configuration for server actions with increased body size limit.
- Document new database migration for project planning assets.

next.config.ts

@@ -1,5 +1,11 @@
 import type { NextConfig } from "next";
 
-const nextConfig: NextConfig = {};
+const nextConfig: NextConfig = {
+  experimental: {
+    serverActions: {
+      bodySizeLimit: "8mb",
+    },
+  },
+};
 
 export default nextConfig;