Support iOS Scribble for hand written text entry with Apple Pencil

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**Description**

An Apple Pencil stylus can be used to navigate the Mergin app, but not to write data into form fields. On our test iPad, we are able to enter hand written text with the Apple Pencil in other applications, e.g. Safari, but in Mergin, no text is entered.

The system for handwritten text with the Apple Pencil is called Scribble. It should work with any text field, but it doesn't seem to recognise the Mergin forms.

https://support.apple.com/en-gb/guide/ipad/ipad355ab2a7/26/ipados/26

**Environment**

Production

**Application (+ app version, build, operating system)**

Mergin Maps mobile v2026.4.0
iOS26.6
iPAD8,3

Diagnostic log sent: 2026-09-18
Workspace ID: 60361

**Steps to reproduce**

+ Use the Apple Pencil stylus to click within Mergin Input to open up a feature form
+ Click on an editable text field
+ Begin writing by hand

**Actual results**

+ Nothing happens

**Expected results**

+ Stylus draws handwritten line and then converts it into text.

Reproduce the problem on an iPad with Apple Pencil by opening a Mergin Input feature form and selecting an editable text field. Inspect the mobile form text-input handling and verify that handwriting is accepted and converted to text in the field; confirm the behavior on the stated iOS environment.

Written by the indexing model from the issue text.