Show Icon Field Editor Is Clipped When the Block Is Centered in the Workspace

[Nina-1210]

Describe the bug
When the Show icon block is centered in the workspace, the icon picker gets cut off, preventing access to some icons.

Steps to reproduce the behavior:

1. Navigate to Microsoft MakeCode for micro:bit.
2. Open an existing project or a Blocks Start tutorial.
3. Add a Show icon block near the center of the visible workspace.
4. Open the icon field editor.
5. Scroll to the top or bottom of icons.
6. Observe the icon picker.

Actual behavior
The top or bottom of icons is cut off and cannot be fully accessed.

Expected behavior
All icon options should be visible and selectable regardless of the block's position in the workspace.

Screenshots

Additional context
1.OS: Windows 11 25H2 & Mac Mini M2 macOS Tahoe 26.5.2
2.Browser: Chrome, Edge, Firefox, and Safari
3.makecode.microbit.org version: 9.0.8
4.Microsoft MakeCode version: 13.0.5