[Bug] Scrolling when selecting on IOS

### Bug Description

The IOS version of AppFlowy tends to scroll whenever I select text, making me select a bunch of text I didn’t want selected.

### How to Reproduce

Select text in a document.
Attempt to move the bars on either side of the selection.

### Expected Behavior

I expected the selection to simply expand to wherever I moved the bars to, so I can easily bolden or italicize pre-written text.

### Operating System

26.5

### AppFlowy Version(s)

0.13.0

### Screenshots

_No response_

### Additional Context

_No response_

Reproduce the selection-handle behavior on iOS 26.5 with AppFlowy 0.13.0, then trace the Flutter text-selection handling used by document editing. Done means dragging either selection handle expands the selection without unintended scrolling, so the selected text matches the handle position.

Written by the indexing model from the issue text.