phsl / new-api

Introduce a generic `renderLimitedItems` helper within `ModelsColumnDefs.js` to eliminate duplicated logic for list-style columns.

Key changes
• Added `renderLimitedItems` to handle item limiting, “+N” indicator, and popover display.
• Migrated `renderTags`, `renderEndpoints`, and `renderBoundChannels` to use the new helper.
• Removed redundant inline implementations, reducing complexity and improving readability.
• Preserved previous UX: first 3 items shown, overflow accessible via popover.

This refactor streamlines code maintenance and ensures consistent behavior across related columns.