The tab bar retires — boards are the app, settings behind the gear, recency the default order

The boards stack becomes the root screen: Settings moves from its own
tab to a sheet behind a leading gearshape button, the sort pickers trade
their text segments for symbols (hand.draw, textformat.abc, clock) with
the words kept for accessibility, and every list now opens sorted by
most recent change. UI tests re-aimed at the gear button and Done-button
scoping fixed for the sheet-over-sheet nav bars — 4/4 green in the
simulator.

Claude-Session: https://claude.ai/code/session_01SR4XGjmBE16ZUYWpfFHXwY

KanbanMobile/App/MobileApp.swift

@@ -1,7 +1,7 @@
 import SwiftUI
 
-/// The iPhone app's entry point. Two tabs, per the mobile MVP charter: Boards (the whole
-/// board → lane → card navigation stack) and Settings.
+/// The iPhone app's entry point. The boards navigation stack (board → lane → card) is the whole
+/// app; Settings lives behind the gear button on the board list rather than a tab of its own.
 @main
 struct MobileApp: App {
 
@@ -13,21 +13,8 @@ struct MobileApp: App {
 
     var body: some Scene {
         WindowGroup {
-            RootTabView()
+            BoardsTabView()
                 .environment(boardIndex)
         }
     }
 }
-
-struct RootTabView: View {
-    var body: some View {
-        TabView {
-            Tab("Boards", systemImage: "rectangle.stack") {
-                BoardsTabView()
-            }
-            Tab("Settings", systemImage: "gearshape") {
-                SettingsTabView()
-            }
-        }
-    }
-}