I'll create a basic left sidebar and a masonry layout using the masonic library. Let's build this step by step.

This implementation creates a responsive layout with a collapsible sidebar on the left and a masonry grid using the masonic library. Here's what I've built:

1. Left Sidebar: Using shadcn/ui's sidebar component 1, I've created a collapsible sidebar with navigation items and proper header/footer sections.

2. Masonry Grid: I've implemented a responsive masonry layout using the masonic library that:

   • Adjusts the number of columns based on screen width
   • Generates random colored items with varying heights
   • Includes hover effects for better interactivity

3. Responsive Design: The layout works on both mobile and desktop:

   • On mobile, the sidebar collapses off-canvas and can be toggled with the sidebar trigger
   • The masonry grid adjusts its columns based on available space

To use this code, you'll need to install the masonic library:

The implementation uses React's client components where needed (for the masonry grid and window size hook) while keeping the overall structure server-rendered where possible.