Fix primary navigation editing

TESTING.md

@@ -590,16 +590,18 @@ source update are published, and installs or updates Gotcha through AltStore PAL
 ## Settings, accessibility, and lifecycle
 
 - [ ] Settings opens from the gear button on Home and is not a tab.
-- [ ] Home, Issues, Repositories, Pull Requests, Milestones, Actions, and Server
-      Activity use the destination name as the primary navigation title and the
-      selected server as the smaller subtitle; changing servers updates both.
+- [ ] Home, Issues, Repositories, Pull Requests, Milestones, and Actions use the
+      destination name as the primary navigation title and the selected server
+      as the smaller subtitle; changing servers updates both.
 - [ ] Primary Navigation always keeps Home first and allows up to four ordered,
-      unique choices from Issues, Repos, Pulls, Milestones, Actions, and Server
-      Activity. Add, remove, and reorder destinations with native table
-      controls; tab order updates immediately, omitted destinations remain on
-      Home, and the configuration survives relaunch and server changes. An
-      upgrade from the previous build starts with Issues, Repos, Pulls, and
-      Milestones.
+      unique choices from Issues, Repos, Pulls, Milestones, and Actions. Server
+      Activity remains only the **All users** Home timeline. Outside Edit mode,
+      rows cannot add, remove, or reorder destinations. In Edit mode, native
+      insert, delete, and reorder controls perform all three operations; tab
+      order updates immediately, omitted destinations remain on Home, and the
+      configuration survives relaunch and server changes. Existing saved
+      Server Activity tabs are removed during migration. An upgrade from the
+      previous build otherwise preserves its destination order.
 - [ ] Appearance changes between Auto, Light, and Dark immediately; Auto follows
       the simulator system appearance.
 - [ ] Icon and appearance settings remain selected after relaunch.