Make It So User Availability Is Shown On Availability Chart Mouse-Over

Similar to when2meet. When you mouse over a cell of the chart, somewhere it should display which users are available/unavailable to attend at that time

<img width="2090" height="717" alt="Image" src="https://github.com/user-attachments/assets/27036aa7-bf40-4ef9-b9c5-ceda1a37dd8d" />