add private to bookmark default open setting

apps/weblibre/lib/features/geckoview/features/bookmarks/presentation/screens/bookmark_list.dart

@@ -1032,18 +1032,22 @@ class BookmarkListScreen extends HookConsumerWidget {
           const BrowserRoute().go(context);
         }
       case BookmarkOpenSetting.regular:
+      case BookmarkOpenSetting.private:
       case BookmarkOpenSetting.isolated:
-        final isolated =
-            settings.effectiveBookmarkOpenSetting ==
-            BookmarkOpenSetting.isolated;
+        final effective = settings.effectiveBookmarkOpenSetting;
+        final tabMode = switch (effective) {
+          BookmarkOpenSetting.private => TabMode.private,
+          BookmarkOpenSetting.isolated => TabMode.newIsolated(),
+          _ => TabMode.regular,
+        };
 
         await ref
             .read(tabRepositoryProvider.notifier)
             .addTab(
               url: url,
-              tabMode: isolated ? TabMode.newIsolated() : TabMode.regular,
+              tabMode: tabMode,
               selectTab: true,
-              containerSelection: isolated
+              containerSelection: effective == BookmarkOpenSetting.isolated
                   ? const TabContainerSelection.unassigned()
                   : const TabContainerSelection.useSelected(),
             );

apps/weblibre/lib/features/settings/presentation/screens/browsing_settings.dart

@@ -479,6 +479,15 @@ class _BookmarkOpenBehaviorSection extends HookConsumerWidget {
                   subtitle: Text('Open the bookmark in a regular tab'),
                   secondary: Icon(MdiIcons.tab),
                 ),
+                RadioListTile.adaptive(
+                  value: BookmarkOpenSetting.private,
+                  title: const Text('Private'),
+                  subtitle: const Text('Open the bookmark in a private tab'),
+                  secondary: Icon(
+                    MdiIcons.dominoMask,
+                    color: AppColors.of(context).privateTabPurple,
+                  ),
+                ),
                 const RadioListTile.adaptive(
                   value: BookmarkOpenSetting.customTab,
                   title: Text('Custom Tab'),

apps/weblibre/lib/features/user/data/models/general_settings.dart

@@ -92,7 +92,7 @@ enum TabIntentOpenSetting { regular, private, isolated, ask }
 /// Determines what happens when a bookmark is tapped in the bookmark list.
 /// [ask] shows the "open in..." sheet (today's behavior, and the default);
 /// the other values open the bookmark directly with no intermediate prompt.
-enum BookmarkOpenSetting { regular, isolated, customTab, ask }
+enum BookmarkOpenSetting { regular, private, isolated, customTab, ask }
 
 enum TabDirection { newestFirst, oldestFirst }
 

apps/weblibre/lib/features/user/data/models/general_settings.g.dart

@@ -1352,6 +1352,7 @@ const _$TabIntentOpenSettingEnumMap = {
 
 const _$BookmarkOpenSettingEnumMap = {
   BookmarkOpenSetting.regular: 'regular',
+  BookmarkOpenSetting.private: 'private',
   BookmarkOpenSetting.isolated: 'isolated',
   BookmarkOpenSetting.customTab: 'customTab',
   BookmarkOpenSetting.ask: 'ask',