[QT-based Mobile app] ui/ux issues - Onboarding

[sunleos]

Bug Report

1. Welcome screen -> Language selector -> the language list is not visible behind the keyboard
   Expected: I can see the full content of the bottom sheet when the keyboard is shown on the screen

2. User should be able to close a bottom sheet on a swipe down (currently, it does nothing on a swipe down)

3. The screen content overlaps with the keyboard

4. The screen content overlaps with the keyboard

• Status desktop version: https://github.com/status-im/status-desktop/actions/runs/18540149905
• Operating System: Android 15

[noeliaSD]

• The Bottom Sheet + Searcher component currently have an incorrect global behavior pattern. This issue is also present in other flows, such as search within chat or channel conversations.
• Seed phrase page is already in code review here: Enter seed phrase component refactored according to new design #19004