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/apps/client/pubspec.yaml

@@ -33,8 +33,9 @@ dependencies:
   client_create_order:
     path: ../../packages/features/client/orders/create_order
   krow_core:
-     path: ../../packages/core
-  
+    path: ../../packages/core
+  krow_domain:
+    path: ../../packages/domain
   cupertino_icons: ^1.0.8
   flutter_modular: ^6.3.2
   flutter_bloc: ^8.1.3

apps/mobile/apps/staff/pubspec.yaml

@@ -28,6 +28,8 @@ dependencies:
     path: ../../packages/features/staff/staff_main
   krow_core:
     path: ../../packages/core
+  krow_domain:
+    path: ../../packages/domain
   cupertino_icons: ^1.0.8
   flutter_modular: ^6.3.0
   firebase_core: ^4.4.0