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/lib/src/presentation/widgets/profile_page_skeleton/menu_section_skeleton.dart

@@ -26,9 +26,9 @@ class MenuSectionSkeleton extends StatelessWidget {
       crossAxisAlignment: CrossAxisAlignment.start,
       children: <Widget>[
         // Section title placeholder
-        Padding(
-          padding: const EdgeInsets.only(left: UiConstants.space1),
-          child: const UiShimmerLine(width: 100, height: 12),
+        const Padding(
+          padding: EdgeInsets.only(left: UiConstants.space1),
+          child: UiShimmerLine(width: 100, height: 12),
         ),
         const SizedBox(height: UiConstants.space3),
         // Menu items grid

apps/mobile/packages/features/staff/profile/lib/src/presentation/widgets/profile_page_skeleton/profile_header_skeleton.dart

@@ -25,18 +25,18 @@ class ProfileHeaderSkeleton extends StatelessWidget {
           bottom: Radius.circular(UiConstants.space6),
         ),
       ),
-      child: SafeArea(
+      child: const SafeArea(
         bottom: false,
         child: Column(
           children: <Widget>[
             // Avatar placeholder
-            const UiShimmerCircle(size: 112),
-            const SizedBox(height: UiConstants.space4),
+            UiShimmerCircle(size: 112),
+            SizedBox(height: UiConstants.space4),
             // Name placeholder
-            const UiShimmerLine(width: 160, height: 20),
-            const SizedBox(height: UiConstants.space2),
+            UiShimmerLine(width: 160, height: 20),
+            SizedBox(height: UiConstants.space2),
             // Level badge placeholder
-            const UiShimmerBox(width: 100, height: 24),
+            UiShimmerBox(width: 100, height: 24),
           ],
         ),
       ),

apps/mobile/packages/features/staff/profile/lib/src/presentation/widgets/profile_page_skeleton/profile_page_skeleton.dart

@@ -26,13 +26,11 @@ class ProfilePageSkeleton extends StatelessWidget {
             // Content offset to overlap the header bottom radius
             Transform.translate(
               offset: const Offset(0, -UiConstants.space6),
-              child: Padding(
-                padding: const EdgeInsets.symmetric(
-                  horizontal: UiConstants.space5,
-                ),
+              child: const Padding(
+                padding: EdgeInsets.symmetric(horizontal: UiConstants.space5),
                 child: Column(
                   spacing: UiConstants.space6,
-                  children: const <Widget>[
+                  children: <Widget>[
                     // Reliability stats row (5 items)
                     ReliabilityStatsSkeleton(),