Performance

Faster Shift Pasting
Rapid Ctrl+V paste operations on the schedule no longer cause the page to freeze. Paste operations are now batched so multiple quick pastes trigger a single refresh instead of cascading re-renders.

Smoother Schedule Rendering
Optimised the schedule view to reduce unnecessary re-renders and speed up data lookups:

• Replaced slow list searches with instant lookups for leave data
• Reduced the number of store subscriptions per cell to only what each cell needs
• Stabilised column definitions so they do not recreate on every data fetch
• Cached DOM queries to avoid repeated lookups during drag operations