[BUG] Delete keyboard shortcut listed in docs but not working in the editor

**Describe the bug**
The documentation shows DEL → Delete selected element, but the shortcut does not work anywhere in the editor (tables, notes, areas, relationships).
This suggests the feature is documented but not implemented.

**To Reproduce**
Steps to reproduce the behavior:
1. Create any element
2. Select it
3. Press Delete
4. Nothing happens

**Expected behavior**
Pressing Delete removes the selected element as documented.

**Screenshots**


https://github.com/user-attachments/assets/c914ea71-4e56-4946-a3b3-5bc3ac7841f0

I’ve attached:

📸 Screenshot from the official shortcut list

🎥 Screen recording showing that pressing Delete has no effect

Desktop:
OS: macOS
Browser: Google Chrome (latest)
Reproducible: Yes (both normal and incognito mode)