Incorrect step value behavior in numeric field - increments by +1 instead of 0

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**Description**
When a numeric field is configured with following conditions: (Min:-10,Max10,Step 0, Prec 0), the value should not change, since the step is set to 0. However, the field incorrectly increments/decrements by +1 instead of remaining unchanged. **The configuration works correctly in the QGIS, the issue occurs only in mobile application**

**Environment**
Staging

**Application (+ app version, build, operating system)**
App version: 2025.7.0 (build 814011)
iOS version: iOS 26.0

**Steps to reproduce**

1. Open MerginMaps application on the mobile device
2. Open **the project tester-ws-1/tc05_decimals**
3. Click on Add button and Record a new feature
4. Open the feature form and **in the tab Range Edit - Min/Max** scroll down to the last field
5. Click on the “+” or “-” buttons next to the input field
6. Observe how the field behaves according to the description in the name

**Actual results**
The field value increases or decreases by 1

**Expected results**
The field value should stay the same when step = 0.

https://github.com/user-attachments/assets/9a61253c-a7b3-4031-bd82-b610c5981d50

Reproduce the behavior in the Mergin Maps mobile application using project tester-ws-1/tc05_decimals on the stated iOS environment. Start with the Range Edit - Min/Max field and compare the + and - button behavior when the configured step is 0 against the expected unchanged value.

Written by the indexing model from the issue text.