Speed up the list pages

Clicking a filter used to flash loading placeholders across the whole sidebar, lag the checkbox tick, and swap the table to skeleton rows on every change.

• Fixed checkboxes so they respond instantly on click, with options and counts staying visible while updated numbers load in the background
• Improved the table to keep showing results during filter changes instead of clearing to a loading state, and selections now reset when filters change
• Added smooth open and close animations to filter sections, clear retry messaging when options fail to load, and consistent loading placeholders across all filter types