Feature 3: Implement "Blocks" Tab with Filtering

[fmontes]

Problem

Authors need to quickly find and reuse blocks. The current Palette lacks a clear, dedicated view for reusable blocks, and there is no filter to help authors locate the right block for the page design.

Goal

Deliver a new "Blocks" tab that lists all reusable blocks available to the page, with filtering and search capability. Ensure it uses the same shared pagination and sorting controls as other tabs.

Personas

• Content Author

Demo Expectations

Demo the "Blocks" tab with working filter/search. Show drag-and-drop or insert action works and blocks appear correctly on the page.

[github-actions]

This issue is stale because it has been open 90 days with no activity. Remove stale label or comment or this will be closed in 30 days.

[rjvelazco]

We’re closing this ticket since the work was completed during the hackathon, and the related PR has already been merged: #33660