This commit introduces a new Essentials Toolbar feature to Zen. It provides a more streamlined and organized way for users to access frequently used bookmakrs directly from the sidebar.
- Added `ZenEssentialsToolbar.mjs` to provide the logic for the toolbar.
- Updated the sidebar CSS (`zen-sidebar.css`) to style the Essentials Toolbar.
- Modified `ZenStartup.mjs` to initialize the Essentials Toolbar.
- Made changes to `browserPlacesViews-js.patch` to integrate with existing bookmark functionality.
- Added a new preference `zen.essentials.enabled` to enable/disable the Essentials Toolbar.