Date field displays incomplete date in filtering — iOS only

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**Description**
When using the filtering functionality in the Mergin Maps mobile app on iOS, a date field displays an incomplete date value. The date is not rendered in full, resulting in a missing or truncated date format that does not reflect the complete date stored in the field. The issue is reproducible on iOS only.

**Environment**
[x ] Staging

**Application (+ app version, build, operating system)**
Mergin Maps Mobile App — iOS only
- App version: 2026.3.0-RC1
- iOS version: 26.6.921312
- Device: iPhone 15 / iOS 26.5

**Steps to reproduce**
1. Open the Mergin Maps mobile app and open a project containing a layer with a **Date** field.
2. Tap the **Filter** button to open the filtering panel.
3. Select the **Date** field as the filter criteria.
4. Observe the date value displayed in the filter.

**Actual results**
The date field displays an incomplete date — part of the date value is missing or truncated in the filter panel on iOS.

**Expected results**
The date field should display the full and correctly formatted date value in the filtering panel.

**Screenshots or logs**

*Conclusion*
*Created by Claude and supervised by a human test analyst.*

Reproduce the issue in the Mergin Maps mobile app by opening the filtering panel for a layer with a Date field on iOS. Trace the date value displayed in that panel and verify that the complete, correctly formatted date appears there without truncation.

Written by the indexing model from the issue text.