Refactor widgets & imports; add krow_domain

Add local krow_domain dependency to client, staff apps and client home package. Numerous UI/widget cleanups across features: add const where applicable, use explicit List<Widget> types and List<Widget>.generate, add super.key to constructors, tighten BlocProvider generics, replace some Containers with SizedBox, and simplify InputDecoration/Border constructors. Fix API error handler to return a const UnknownException. Update internal imports to package-style paths (staff_home, staff_payments, staff_main repository interface) and normalize Flutter imports (use material.dart). Add missing braces for early returns in tax form pages. Mostly formatting and small API/typing refactors with no behavioral changes intended.

apps/mobile/packages/features/staff/profile_sections/onboarding/profile_info/lib/src/presentation/widgets/personal_info_page/tappable_row.dart

@@ -39,11 +39,11 @@ class TappableRow extends StatelessWidget {
     return Column(
       crossAxisAlignment: CrossAxisAlignment.start,
       spacing: UiConstants.space3,
-      children: [
+      children: <Widget>[
         FieldLabel(text: i18n.locations_label),
         GestureDetector(
           onTap: enabled ? onTap : null,
-          child: Container(
+          child: SizedBox(
             width: double.infinity,
             child: Row(
               children: <Widget>[