Duplicate-field warning text is truncated on project creation

Description:
When creating a new project, if a user adds a field with the same name as an existing field, the duplicate-field warning message is truncated and cannot be read in full.

Environment:
Staging

Application (app version / build / OS):
App: Mergin Maps Mobile (Android)
App version: 2026.1.1 (build 776151)
Device/OS: Samsung Galaxy A53 5G / Android 15

Steps to reproduce:

1. Go to the project creation screen.
2. Add one or more custom fields.
3. Add another field with the same name as an existing field.
4. Observe the duplicate-field validation/warning message that appears at the top of the screening section.

Actual results:
The duplicate-field warning appears, but the text is truncated (cut off) and the user cannot read the full message explaining the problem.

Expected results:
The full warning message should be visible and readable (no clipping).

Screen-record:

https://github.com/user-attachments/assets/b31a70db-3740-45f6-888a-7096b7762f29

Start at the project creation screen on Android and reproduce the duplicate-field warning using the listed steps. Inspect how that validation message is displayed at the top of the screening section, then repeat the steps to confirm the full warning is visible without clipping.