* fix: Currency picker UI when keyboard is showing
* refactor: move picker logic into the common Picker widget
- CurrencyPicker uses the common Picker widget in grid mode
- SeedLanguagePicker uses the common Picker widget in grid mode
- Added logic for keyboard showing UI into Picker widget
- Added `softWrap: true` to the item text, so it doesn't overflow
* fix: remove subPickerItemsList
* fix: add final
* fix: move function out of initState()
* fix: keep build functions separate to remove boolean comparisons
* fix: remove onItemSelected from already selected item
* fix: change Expanded for Flexible widget
