Shopify Masonry Layout Fix

Need a Shopify expert to:
1️⃣ Convert all collection pages (Dawn theme) into a masonry layout that supports mixed image sizes (square, landscape, portrait).
2️⃣ Display a list of selected collections (e.g., Abstract, Animals, Nature, Pop Art, etc.) in the left-side filter panel so customers can easily browse between collections.
3️⃣ Must work with Shopify’s native filters, sorting, pagination, and lazy-loading — no apps.
4️⃣ Keep quick-view, badges, and product cards fully functional.
5️⃣ Responsive layout across desktop, tablet, and mobile.
6️⃣ Deliver clean edits in: main-collection-product-grid.liquid, masonry.css, and masonry.js.
7️⃣ Quick completion preferred — budget open for experienced Shopify developers.