Markdown rendering : tables with image are not rendered very nicely

[abey79]

For example:

This is generated from this markdown table:

| *Ignore* | *Accept* | *Reject* |
| --- | --- | --- |
| Gray pill | Blue pill | Gray pill |
| Hand cursor | Hand cursor | No-drop cursor |
| ![ignore](https://static.rerun.io/dnd-cursor-ignore/ec48f64a119bddd2c9cbd55410021ef0e1a30feb/full.png) | ![accept](https://static.rerun.io/dnd-cursor-accept/7b40cd79fd99ba2c31617d2f40f56c5c8ba3aca0/full.png) | ![reject](https://static.rerun.io/dnd-cursor-reject/6f105e9689be33b2e0fff5bb1ad42cbb6271b622/full.png) |

Compare with Github's rendering:

Ignore	Accept	Reject
Gray pill	Blue pill	Gray pill
Hand cursor	Hand cursor	No-drop cursor

Repro with check_entity_drag_and_drop.py, introduced by #8431

[abey79]

First step is to identify is this is due to egui_markdown or our custom style. There might be two issues:

• the cropped table frame
• the wrong table geometry