fix(tabs): announce the active tab to VoiceOver on tab switch (#1490)

CHANGELOG.md

@@ -30,6 +30,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 
+- VoiceOver announces the active tab title when you switch between window tabs. (#1490)
 - Opening a query tab no longer pulls keyboard focus away from the sidebar or another control; the editor takes focus only when nothing else holds it. VoiceOver now labels the SQL editor and the Clear and Format buttons. (#1490)
 - The connection form opens with the Name field focused, Return or the Down arrow in the welcome search moves to the connection list, and focus returns to the list after a sheet closes, so you can set up a connection without the mouse. (#1490)
 - Escape now dismisses search-based sheets and popovers (database switcher, quick switcher, column and connection pickers). Pressing Escape clears the search text first; a second Escape closes the sheet. (#1490)

TablePro/Views/Main/Extensions/MainContentCoordinator+WindowLifecycle.swift

@@ -30,6 +30,7 @@ extension MainContentCoordinator {
         evictionTask = nil
 
         syncSidebarToSelectedTab()
+        announceActiveTabToVoiceOver()
 
         Self.lifecycleLogger.debug(
             "[switch] coordinator.handleWindowDidBecomeKey done connId=\(self.connectionId, privacy: .public) totalMs=\(Int(Date().timeIntervalSince(t0) * 1_000))"
@@ -82,6 +83,20 @@ extension MainContentCoordinator {
         )
     }
 
+    /// Announce the active tab title to VoiceOver when the window becomes key,
+    /// so assistive-technology users get the same context the window title gives.
+    private func announceActiveTabToVoiceOver() {
+        guard let title = tabManager.selectedTab?.title, !title.isEmpty else { return }
+        NSAccessibility.post(
+            element: NSApp as Any,
+            notification: .announcementRequested,
+            userInfo: [
+                .announcement: title,
+                .priority: NSAccessibilityPriorityLevel.medium.rawValue,
+            ]
+        )
+    }
+
     // MARK: - Sidebar Sync
 
     /// Update the window-scoped sidebar selection so the active table tab