fix: recover chat replies and organize setup navigation [skip ci]

Targeted source-only patch from reviewed local e370485. Adds bounded realtime/catch-up recovery and moves the setup wizard under System. Static checks only; regression tests, full build and runtime verification have not been run. No deployment. Separate hardening-review branch is not merged. Expected tree: 6235478b9a.

web/lib/navigation.tsx

@@ -1,3 +1,4 @@
+// Modified to move the setup wizard navigation item into the System section.
 import {
   BotMessageSquareIcon,
   BookOpenIcon,
@@ -107,11 +108,6 @@ export const dashboardNavSections: DashboardNavSectionConfig[] = [
         url: "/dashboard",
         icon: <LayoutDashboardIcon />,
       },
-      {
-        titleKey: "nav.setupWizard",
-        url: "/dashboard/setup",
-        icon: <ListChecksIcon />,
-      },
       {
         titleKey: "nav.conversations",
         url: "/dashboard/conversations",
@@ -268,6 +264,11 @@ export const dashboardNavSections: DashboardNavSectionConfig[] = [
     titleKey: "nav.system",
     icon: <ShieldCheckIcon />,
     items: [
+      {
+        titleKey: "nav.setupWizard",
+        url: "/dashboard/setup",
+        icon: <ListChecksIcon />,
+      },
       {
         titleKey: "nav.users",
         url: "/dashboard/users",