fix(navigation): include local library tabs in history

Record the outgoing tab state and scroll before switching, restore same-view history entries, and route sidebar tab requests through the same path without duplicating the initial landing. Add shared CI and local regressions for source filtering and tab transitions.

cx

crates/qbz-qt/qml/shell/ContentRouter.qml

@@ -567,11 +567,14 @@ Item {
     /// line number.) A handler runs once per item change and registers no
     /// dependency, so the guard survives and the cycle does not.
     property bool _itemTabbed: false
+    property bool _itemTabRequest: false
     Connections {
         target: viewLoader
         function onItemChanged() {
             root._itemTabbed = viewLoader.item !== null
                 && typeof viewLoader.item.activeTab === "string"
+            root._itemTabRequest = viewLoader.item !== null
+                && typeof viewLoader.item.tabNavigationRequest !== "undefined"
         }
     }
 
@@ -590,12 +593,14 @@ Item {
 
     Binding {
         target: viewLoader.item
-        property: "activeTab"
+        property: root._itemTabRequest ? "tabNavigationRequest" : "activeTab"
         when: !root._armed
               && root._itemTabbed
               && QbzShell.navTab !== ""
               && QbzShell.navTabView === QbzShell.currentView
-        value: (QbzShell.navTabSeq, QbzShell.navTab)
+        value: root._itemTabRequest
+            ? ({ "tab": QbzShell.navTab, "sequence": QbzShell.navTabSeq })
+            : (QbzShell.navTabSeq, QbzShell.navTab)
         restoreMode: Binding.RestoreNone
     }
 }