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/compliance/certificates/lib/src/presentation/widgets/certificate_upload_page/certificate_metadata_fields.dart

@@ -5,6 +5,7 @@ import 'package:core_localization/core_localization.dart';
 /// Widget for certificate metadata input fields (name, issuer, number).
 class CertificateMetadataFields extends StatelessWidget {
   const CertificateMetadataFields({
+    super.key,
     required this.nameController,
     required this.issuerController,
     required this.numberController,
@@ -32,9 +33,7 @@ class CertificateMetadataFields extends StatelessWidget {
           enabled: isNewCertificate,
           decoration: InputDecoration(
             hintText: t.staff_certificates.upload_modal.name_hint,
-            border: OutlineInputBorder(
-              borderRadius: UiConstants.radiusLg,
-            ),
+            border: OutlineInputBorder(borderRadius: UiConstants.radiusLg),
           ),
         ),
         const SizedBox(height: UiConstants.space4),
@@ -50,27 +49,20 @@ class CertificateMetadataFields extends StatelessWidget {
           enabled: isNewCertificate,
           decoration: InputDecoration(
             hintText: t.staff_certificates.upload_modal.issuer_hint,
-            border: OutlineInputBorder(
-              borderRadius: UiConstants.radiusLg,
-            ),
+            border: OutlineInputBorder(borderRadius: UiConstants.radiusLg),
           ),
         ),
         const SizedBox(height: UiConstants.space4),
 
         // Certificate Number Field
-        Text(
-          'Certificate Number',
-          style: UiTypography.body2m.textPrimary,
-        ),
+        Text('Certificate Number', style: UiTypography.body2m.textPrimary),
         const SizedBox(height: UiConstants.space2),
         TextField(
           controller: numberController,
           enabled: isNewCertificate,
           decoration: InputDecoration(
             hintText: 'Enter number if applicable',
-            border: OutlineInputBorder(
-              borderRadius: UiConstants.radiusLg,
-            ),
+            border: OutlineInputBorder(borderRadius: UiConstants.radiusLg),
           ),
         ),
       ],

apps/mobile/packages/features/staff/profile_sections/compliance/certificates/lib/src/presentation/widgets/certificate_upload_page/certificate_upload_actions.dart

@@ -8,6 +8,7 @@ import '../../blocs/certificate_upload/certificate_upload_cubit.dart';
 /// Widget for attestation checkbox and action buttons in certificate upload form.
 class CertificateUploadActions extends StatelessWidget {
   const CertificateUploadActions({
+    super.key,
     required this.isAttested,
     required this.isFormValid,
     required this.isUploading,
@@ -34,10 +35,9 @@ class CertificateUploadActions extends StatelessWidget {
           children: <Widget>[
             Checkbox(
               value: isAttested,
-              onChanged: (bool? val) =>
-                  BlocProvider.of<CertificateUploadCubit>(context).setAttested(
-                val ?? false,
-              ),
+              onChanged: (bool? val) => BlocProvider.of<CertificateUploadCubit>(
+                context,
+              ).setAttested(val ?? false),
               activeColor: UiColors.primary,
             ),
             Expanded(
@@ -54,17 +54,11 @@ class CertificateUploadActions extends StatelessWidget {
             onPressed: isFormValid ? onUploadPressed : null,
             style: ElevatedButton.styleFrom(
               backgroundColor: UiColors.primary,
-              padding: const EdgeInsets.symmetric(
-                vertical: UiConstants.space4,
-              ),
-              shape: RoundedRectangleBorder(
-                borderRadius: UiConstants.radiusLg,
-              ),
+              padding: const EdgeInsets.symmetric(vertical: UiConstants.space4),
+              shape: RoundedRectangleBorder(borderRadius: UiConstants.radiusLg),
             ),
             child: isUploading
-                ? const CircularProgressIndicator(
-                    color: Colors.white,
-                  )
+                ? const CircularProgressIndicator(color: Colors.white)
                 : Text(
                     t.staff_certificates.upload_modal.save,
                     style: UiTypography.body1m.white,
@@ -87,9 +81,7 @@ class CertificateUploadActions extends StatelessWidget {
                 ),
                 shape: RoundedRectangleBorder(
                   borderRadius: UiConstants.radiusLg,
-                  side: const BorderSide(
-                    color: UiColors.destructive,
-                  ),
+                  side: const BorderSide(color: UiColors.destructive),
                 ),
               ),
             ),

apps/mobile/packages/features/staff/profile_sections/compliance/certificates/lib/src/presentation/widgets/certificate_upload_page/expiry_date_field.dart

@@ -6,6 +6,7 @@ import 'package:core_localization/core_localization.dart';
 /// Widget for selecting certificate expiry date.
 class ExpiryDateField extends StatelessWidget {
   const ExpiryDateField({
+    super.key,
     required this.selectedDate,
     required this.onTap,
   });

apps/mobile/packages/features/staff/profile_sections/compliance/certificates/lib/src/presentation/widgets/certificates_skeleton/certificates_header_skeleton.dart

@@ -12,23 +12,23 @@ class CertificatesHeaderSkeleton extends StatelessWidget {
       width: double.infinity,
       padding: const EdgeInsets.all(UiConstants.space5),
       decoration: const BoxDecoration(color: UiColors.primary),
-      child: SafeArea(
+      child: const SafeArea(
         bottom: false,
         child: Column(
           children: <Widget>[
-            const SizedBox(height: UiConstants.space4),
-            const UiShimmerCircle(size: 64),
-            const SizedBox(height: UiConstants.space3),
+            SizedBox(height: UiConstants.space4),
+            UiShimmerCircle(size: 64),
+            SizedBox(height: UiConstants.space3),
             UiShimmerLine(
               width: 120,
               height: 14,
             ),
-            const SizedBox(height: UiConstants.space2),
+            SizedBox(height: UiConstants.space2),
             UiShimmerLine(
               width: 80,
               height: 12,
             ),
-            const SizedBox(height: UiConstants.space6),
+            SizedBox(height: UiConstants.space6),
           ],
         ),
       ),

apps/mobile/packages/features/staff/profile_sections/compliance/tax_forms/lib/src/presentation/pages/form_i9_page.dart

@@ -178,8 +178,9 @@ class _FormI9PageState extends State<FormI9Page> {
           }
         },
         builder: (BuildContext context, FormI9State state) {
-          if (state.status == FormI9Status.success)
+          if (state.status == FormI9Status.success) {
             return _buildSuccessView(i18n);
+          }
 
           return Scaffold(
             backgroundColor: UiColors.background,

apps/mobile/packages/features/staff/profile_sections/compliance/tax_forms/lib/src/presentation/pages/form_w4_page.dart

@@ -180,8 +180,9 @@ class _FormW4PageState extends State<FormW4Page> {
           }
         },
         builder: (BuildContext context, FormW4State state) {
-          if (state.status == FormW4Status.success)
+          if (state.status == FormW4Status.success) {
             return _buildSuccessView(i18n);
+          }
 
           return Scaffold(
             backgroundColor: UiColors.background,

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>[