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/client/reports/lib/src/presentation/pages/performance_report_page.dart

@@ -24,7 +24,7 @@ class _PerformanceReportPageState extends State<PerformanceReportPage> {
 
   @override
   Widget build(BuildContext context) {
-    return BlocProvider(
+    return BlocProvider<PerformanceBloc>(
       create: (BuildContext context) => Modular.get<PerformanceBloc>()
         ..add(LoadPerformanceReport(startDate: _startDate, endDate: _endDate)),
       child: Scaffold(

apps/mobile/packages/features/client/reports/lib/src/presentation/widgets/report_detail_skeleton.dart

@@ -15,7 +15,7 @@ class ReportDetailSkeleton extends StatelessWidget {
     return UiShimmer(
       child: SingleChildScrollView(
         child: Column(
-          children: [
+          children: <Widget>[
             // Header area (matches the blue header with back button + title)
             Container(
               padding: const EdgeInsets.only(
@@ -26,12 +26,12 @@ class ReportDetailSkeleton extends StatelessWidget {
               ),
               color: UiColors.primary,
               child: Row(
-                children: [
+                children: <Widget>[
                   const UiShimmerCircle(size: UiConstants.space10),
                   const SizedBox(width: UiConstants.space3),
                   Column(
                     crossAxisAlignment: CrossAxisAlignment.start,
-                    children: [
+                    children: <Widget>[
                       UiShimmerBox(
                         width: 140,
                         height: 18,
@@ -57,10 +57,10 @@ class ReportDetailSkeleton extends StatelessWidget {
                     const EdgeInsets.symmetric(horizontal: UiConstants.space5),
                 child: Column(
                   crossAxisAlignment: CrossAxisAlignment.start,
-                  children: [
+                  children: <Widget>[
                     // Summary stat cards row
                     const Row(
-                      children: [
+                      children: <Widget>[
                         Expanded(child: UiShimmerStatsCard()),
                         SizedBox(width: UiConstants.space3),
                         Expanded(child: UiShimmerStatsCard()),
@@ -78,14 +78,14 @@ class ReportDetailSkeleton extends StatelessWidget {
                       ),
                       child: Column(
                         crossAxisAlignment: CrossAxisAlignment.start,
-                        children: [
+                        children: <Widget>[
                           const UiShimmerLine(width: 140, height: 14),
                           const SizedBox(height: UiConstants.space8),
                           Expanded(
                             child: Row(
                               crossAxisAlignment: CrossAxisAlignment.end,
                               mainAxisAlignment: MainAxisAlignment.spaceEvenly,
-                              children: List.generate(7, (int index) {
+                              children: List<Widget>.generate(7, (int index) {
                                 // Varying bar heights for visual interest
                                 final double height =
                                     40.0 + (index * 17 % 120);
@@ -113,20 +113,20 @@ class ReportDetailSkeleton extends StatelessWidget {
                       ),
                       child: Column(
                         crossAxisAlignment: CrossAxisAlignment.start,
-                        children: [
+                        children: <Widget>[
                           const UiShimmerLine(width: 160, height: 14),
                           const SizedBox(height: UiConstants.space6),
-                          ...List.generate(3, (int index) {
+                          ...List<Widget>.generate(3, (int index) {
                             return Padding(
                               padding: const EdgeInsets.only(
                                 bottom: UiConstants.space5,
                               ),
                               child: Column(
-                                children: [
+                                children: <Widget>[
                                   const Row(
                                     mainAxisAlignment:
                                         MainAxisAlignment.spaceBetween,
-                                    children: [
+                                    children: <Widget>[
                                       UiShimmerLine(width: 100, height: 12),
                                       UiShimmerLine(width: 60, height: 12),
                                     ],

apps/mobile/packages/features/client/reports/lib/src/presentation/widgets/reports_page/metrics_grid_skeleton/metric_card_skeleton.dart

@@ -17,10 +17,10 @@ class MetricCardSkeleton extends StatelessWidget {
       ),
       child: Column(
         crossAxisAlignment: CrossAxisAlignment.start,
-        children: [
+        children: <Widget>[
           // Icon + label row
-          Row(
-            children: [
+          const Row(
+            children: <Widget>[
               const UiShimmerCircle(size: UiConstants.space6),
               const SizedBox(width: UiConstants.space2),
               const Expanded(

apps/mobile/packages/features/client/reports/lib/src/presentation/widgets/reports_page/metrics_grid_skeleton/metrics_grid_skeleton.dart

@@ -22,7 +22,7 @@ class MetricsGridSkeleton extends StatelessWidget {
         mainAxisSpacing: UiConstants.space3,
         crossAxisSpacing: UiConstants.space3,
         childAspectRatio: 1.32,
-        children: List.generate(6, (int index) {
+        children: List<Widget>.generate(6, (int index) {
           return const MetricCardSkeleton();
         }),
       ),