TF-4384 Fix page not found 404 error when refreshing label views (#4390)

lib/main/routes/navigation_router.dart

@@ -1,5 +1,6 @@
 
 import 'package:equatable/equatable.dart';
+import 'package:jmap_dart_client/jmap/core/id.dart';
 import 'package:jmap_dart_client/jmap/mail/email/email.dart';
 import 'package:jmap_dart_client/jmap/mail/email/email_address.dart';
 import 'package:jmap_dart_client/jmap/mail/mailbox/mailbox.dart';
@@ -14,6 +15,7 @@ enum DashboardType {
 class NavigationRouter with EquatableMixin {
   final EmailId? emailId;
   final MailboxId? mailboxId;
+  final Id? labelId;
   final DashboardType dashboardType;
   final SearchQuery? searchQuery;
   final String? routeName;
@@ -36,7 +38,11 @@ class NavigationRouter with EquatableMixin {
     this.accountMenuItem = AccountMenuItem.none,
     this.cc,
     this.bcc,
-  });
+    this.labelId,
+  }) : assert(
+          !(mailboxId != null && labelId != null),
+          'NavigationRouter accepts either mailboxId or labelId, not both.',
+        );
 
   factory NavigationRouter.initial() => NavigationRouter();
 
@@ -53,5 +59,6 @@ class NavigationRouter with EquatableMixin {
     accountMenuItem,
     cc,
     bcc,
+    labelId,
   ];
 }

lib/main/routes/route_utils.dart

@@ -20,6 +20,7 @@ abstract class RouteUtils {
   static const String paramID = 'id';
   static const String paramType = 'type';
   static const String paramContext = 'context';
+  static const String paramLabelId = 'labelId';
   static const String paramQuery = 'q';
   static const String paramRouteName = 'routeName';
   static const String paramMailtoAddress = 'mailtoAddress';
@@ -60,7 +61,9 @@ abstract class RouteUtils {
       }
       servicePath = servicePath.withQueryParameters([
         StringQueryParameter(paramType, router.dashboardType.name),
-        if (router.mailboxId != null)
+        if (router.labelId != null)
+          StringQueryParameter(paramLabelId, router.labelId!.value)
+        else if (router.mailboxId != null)
           StringQueryParameter(paramContext, router.mailboxId!.id.value),
         if (router.searchQuery != null)
           StringQueryParameter(paramQuery, router.searchQuery!.value),
@@ -124,6 +127,7 @@ abstract class RouteUtils {
     final idParam = parameters[paramID];
     final typeParam = parameters[paramType];
     final contextPram = parameters[paramContext];
+    final labelIdPram = parameters[paramLabelId];
     final queryParam = parameters[paramQuery];
     final routeName = parameters[paramRouteName];
     final mailtoAddress = parameters[paramMailtoAddress];
@@ -133,7 +137,10 @@ abstract class RouteUtils {
     final body = parameters[paramBody];
 
     final emailId = idParam != null ? EmailId(Id(idParam)) : null;
-    final mailboxId = contextPram != null ? MailboxId(Id(contextPram)) : null;
+    final labelId = labelIdPram != null ? Id(labelIdPram) : null;
+    final mailboxId = labelId == null && contextPram != null
+        ? MailboxId(Id(contextPram))
+        : null;
     final searchQuery = queryParam != null ? SearchQuery(queryParam) : null;
     final dashboardType = DashboardType.values.firstWhereOrNull((type) => type.name == typeParam) ?? DashboardType.normal;
     final settingType = AccountMenuItem.values.firstWhereOrNull((type) => type.getAliasBrowser() == typeParam) ?? AccountMenuItem.none;
@@ -147,6 +154,7 @@ abstract class RouteUtils {
     return NavigationRouter(
       emailId: emailId,
       mailboxId: mailboxId,
+      labelId: labelId,
       searchQuery: searchQuery,
       dashboardType: dashboardType,
       routeName: routeName,