How to reproduce:
1. Create a new project
2. Open the AI Assistant
3. Select one of the shortcuts
4. Start deleting the shortcut from the text field
5. Observe the Assistant

Actual result: Shortcut text turns into rich text and the button becomes greyed out
Expected result: Deleting shortcuts is the same as deleting text

Reproducible with: 1.0.0-pre.1 (6000.3.0a5 (36d7e9fd6645)), 1.0.0-pre.12 (6000.3.0a5 (36d7e9fd6645), 6000.3.2f1, 6000.4.0b2, 6000.5.0a3)
Not reproducible with: 1.0.0-pre.12 (6000.3.0a4)
Could not test with: 6000.0.64f1 (Assistant not supported)

Reproducible on: MacOS Sequoia 15.7.2 (M1 Max)
Not reproducible on: No other environments tested

Notes:
- Issue will persist even if you close the window
- Starting a new conversation fixes the issue
- Issue will not be present if you delete while selecting everything using Ctrl or Cmd + A