Table: Improve feedback when selecting inappropriate cell type

For example, if you select a Gauge cell with sparkline data, you get something like this right now: <img width="217" height="199" alt="Image" src="https://github.com/user-attachments/assets/95a23156-7309-481f-b0a8-b9b55ea7ab67" /> We instead should provide a tooltip and guidance on what's gone wrong to help people resolve their issues with config.