UI picking is offset to the left when Reference DPI and Fallback DPI differ

Reproduction steps:
1. Open the attached “IN-119589” project
2. Select the “--UI/panel settings” in the Project window
3. Make sure “Reference DPI” is 96 and “Fallback DPI” is 120 in the Inspector window
4. Open the “--Scenes/Main” Scene
5. Enter the Play Mode
6. Hover the cursor over the UI elements on the right side of the Game view
7. Observe the in-game “picker” position

Expected result: The “picker” stops exactly at the edge of the UI, correctly matching the rendered layout
Actual result: The “picker” stops further away and re-enables on the UI, as if the UI elements are shifted left (the hit-testing area is offset horizontally)

Reproducible with: 6000.0.61f1, 6000.2.10f1, 6000.3.0b8, 6000.4.0a4

Reproducible on: Ubuntu 25.04, Arch (user)
Not reproducible on: Windows 11