Add Announce Background Messages setting and descriptive footers

- New "Announce Background Messages" toggle in Accessibility section (off by default) — VoiceOver announces messages from non-active buffers when enabled
- Rename "Other Buffers" to "Background Buffer Sounds" in Sounds section
- Add footer descriptions to Save Debug Buffer, Background Buffer Sounds, Status Haptics, and Announce Background Messages

KDChat/Views/ChatBufferView.swift

@@ -49,8 +49,9 @@ struct ChatBufferView: View {
                         playBufferSound()
                     }
 
-                    // Announce + haptic — active buffer only
+                    // Announce + haptic
-                    if isActive {
+                    let announceOther = UserDefaults.standard.bool(forKey: "announce_other_buffers")
+                    if isActive || announceOther {
                         if !last.isSystem {
                             AccessibilityNotification.Announcement(
                                 "\(last.senderName): \(last.content)"

KDChat/Views/SettingsView.swift

@@ -31,6 +31,7 @@ struct SettingsView: View {
     @AppStorage("sounds_map") private var mapSound = true
     @AppStorage("sounds_dm") private var dmSound = true
     @AppStorage("sounds_background_buffers") private var backgroundBufferSounds = true
+    @AppStorage("announce_other_buffers") private var announceOtherBuffers = false
     @Environment(\.modelContext) private var modelContext
     @State private var showDeleteConfirmation = false
 
@@ -43,7 +44,7 @@ struct SettingsView: View {
 
     var body: some View {
         Form {
-            Section("Messages") {
+            Section {
                 Toggle("Save Messages", isOn: $saveMessages)
                 Toggle("Save Debug Buffer", isOn: $saveDebugBuffer)
                     .disabled(!saveMessages)
@@ -67,9 +68,13 @@ struct SettingsView: View {
                 } message: {
                     Text("Are you sure you want to delete all messages from all buffers?")
                 }
+            } header: {
+                Text("Messages")
+            } footer: {
+                Text("Save Debug Buffer saves system and debug messages between sessions.")
             }
 
-            Section("Sounds") {
+            Section {
                 Toggle("Sounds", isOn: $soundsEnabled)
                 Toggle("Global Chat", isOn: $globalSound)
                     .disabled(!soundsEnabled)
@@ -77,16 +82,32 @@ struct SettingsView: View {
                     .disabled(!soundsEnabled)
                 Toggle("Direct Messages", isOn: $dmSound)
                     .disabled(!soundsEnabled)
-                Toggle("Other Buffers", isOn: $backgroundBufferSounds)
+                Toggle("Background Buffer Sounds", isOn: $backgroundBufferSounds)
                     .disabled(!soundsEnabled)
+            } header: {
+                Text("Sounds")
+            } footer: {
+                Text("Background Buffer Sounds plays sounds for messages in buffers you're not currently viewing.")
             }
 
-            Section("Haptics") {
+            Section {
                 Toggle("Haptics", isOn: $hapticsEnabled)
                 Toggle("Message Haptics", isOn: $messageHaptics)
                     .disabled(!hapticsEnabled)
                 Toggle("Status Haptics", isOn: $statusHaptics)
                     .disabled(!hapticsEnabled)
+            } header: {
+                Text("Haptics")
+            } footer: {
+                Text("Status Haptics provides feedback for system events such as connect and disconnect.")
+            }
+
+            Section {
+                Toggle("Announce Background Messages", isOn: $announceOtherBuffers)
+            } header: {
+                Text("Accessibility")
+            } footer: {
+                Text("When on, VoiceOver announces new messages from buffers you're not currently viewing.")
             }
 
             Section {