refactor: enhance navigation robustness by introducing popSafe and safePushNamedAndRemoveUntil methods and updating their usage.

apps/mobile/packages/features/staff/shifts/lib/src/presentation/pages/shift_details_page.dart

@@ -227,12 +227,12 @@ class _ShiftDetailsPageState extends State<ShiftDetailsPage> {
         content: Text(i18n.message),
         actions: [
           TextButton(
-            onPressed: () => Modular.to.pop(),
+            onPressed: () => Modular.to.popSafe(),
             child: Text(Translations.of(context).common.cancel),
           ),
           TextButton(
             onPressed: () {
-              Modular.to.pop();
+              Modular.to.popSafe();
               _showApplyingDialog(context, shift);
               BlocProvider.of<ShiftDetailsBloc>(context).add(
                 BookShiftDetailsEvent(
@@ -317,7 +317,11 @@ class _ShiftDetailsPageState extends State<ShiftDetailsPage> {
           children: [
             const Icon(UiIcons.warning, color: UiColors.error),
             const SizedBox(width: UiConstants.space2),
-            Expanded(child: Text(context.t.staff_shifts.shift_details.eligibility_requirements)),
+            Expanded(
+              child: Text(
+                context.t.staff_shifts.shift_details.eligibility_requirements,
+              ),
+            ),
           ],
         ),
         content: Text(
@@ -333,7 +337,7 @@ class _ShiftDetailsPageState extends State<ShiftDetailsPage> {
             text: "Go to Certificates",
             onPressed: () {
               Navigator.of(ctx).pop();
-              Modular.to.pushNamed(StaffPaths.certificates);
+              Modular.to.toCertificates();
             },
           ),
         ],