Fix keyboard covering alert buttons on iPad landscape (#300)

[dogo]

Fixes issue #.

• This pull request follows the coding standards

This PR changes:

Problem

On iPad in landscape mode, the keyboard covers the alert buttons when tapping a text field.

Root Cause

The previous implementation compared local view coordinates with screen coordinates from the keyboard notification, causing incorrect offset calculations.

Fix

• Convert _contentView frame to screen coordinates before comparing with keyboard frame
• Use keyboard animation duration/curve for smooth synchronized transitions
• Only move alert when there's actual overlap with keyboard

Fixes #300