Add dock badge count for agent statuses needing attention

Show a numeric badge on the dock icon for worktrees with .permission
(Input) or .review (Done) agent statuses. Badge updates reactively via
Combine and persists until statuses are acknowledged in the sidebar.

Author: nicosuave

macos/Sources/App/macOS/AppDelegate.swift

@@ -1,4 +1,5 @@
 import AppKit
+import Combine
 import SwiftUI
 import UserNotifications
 import OSLog
@@ -155,6 +156,7 @@ class AppDelegate: NSObject,
     private var appearanceObserver: NSKeyValueObservation? = nil
 
     private var userDefaultsObserver: NSObjectProtocol? = nil
+    private var agentStatusBadgeCancellable: AnyCancellable?
 
     /// Signals
     private var signals: [DispatchSourceSignal] = []
@@ -312,16 +314,23 @@ class AppDelegate: NSObject,
         // Setup signal handlers
         setupSignals()
 
+        // Observe agent status changes to update the dock badge count
+        agentStatusBadgeCancellable = worktrunkStore.$agentStatusByWorktreePath
+            .receive(on: DispatchQueue.main)
+            .sink { [weak self] _ in
+                self?.updateDockBadgeForAgentStatus()
+            }
+
         switch Ghostty.launchSource {
         case .app:
             // Don't have to do anything.
             break
-            
+
         case .zig_run, .cli:
             // Part of launch services (clicking an app, using `open`, etc.) activates
             // the application and brings it to the front. When using the CLI we don't
             // get this behavior, so we have to do it manually.
-            
+
             // This never gets called until we click the dock icon. This forces it
             // activate immediately.
             applicationDidBecomeActive(.init(name: NSApplication.didBecomeActiveNotification))
@@ -345,8 +354,8 @@ class AppDelegate: NSObject,
         // If we're back manually then clear the hidden state because macOS handles it.
         self.hiddenState = nil
 
-        // Clear the dock badge when the app becomes active
-        self.setDockBadge(nil)
+        // Recalculate dock badge: keep agent status count, clear transient bell badge
+        self.updateDockBadgeForAgentStatus()
 
         // First launch stuff
         if (!applicationHasBecomeActive) {
@@ -877,6 +886,11 @@ class AppDelegate: NSObject,
         _ = TerminalController.newTab(ghostty, from: window, withBaseConfig: config)
     }
 
+    private func updateDockBadgeForAgentStatus() {
+        let count = worktrunkStore.attentionCount
+        setDockBadge(count > 0 ? "\(count)" : nil)
+    }
+
     private func setDockBadge(_ label: String? = "•") {
         NSApp.dockTile.badgeLabel = label
         NSApp.dockTile.display()

macos/Sources/Features/Worktrunk/WorktrunkStore.swift

@@ -162,7 +162,7 @@ final class WorktrunkStore: ObservableObject {
     @Published private var worktreesByRepositoryID: [UUID: [Worktree]] = [:]
     @Published private var sessionsByWorktreePath: [String: [AISession]] = [:]
     @Published private var gitTrackingByWorktreePath: [String: GitTracking] = [:]
-    @Published private var agentStatusByWorktreePath: [String: WorktreeAgentStatusEntry] = [:]
+    @Published private(set) var agentStatusByWorktreePath: [String: WorktreeAgentStatusEntry] = [:]
     @Published var isRefreshing: Bool = false
     @Published var errorMessage: String? = nil
     @Published private(set) var sidebarModelRevision: Int = 0
@@ -250,6 +250,13 @@ final class WorktrunkStore: ObservableObject {
         agentStatusByWorktreePath[worktreePath]?.status
     }
 
+    /// Number of worktrees with statuses that need user attention (.permission or .review).
+    var attentionCount: Int {
+        agentStatusByWorktreePath.values.filter {
+            $0.status == .permission || $0.status == .review
+        }.count
+    }
+
     func acknowledgeAgentStatus(for worktreePath: String) {
         guard let entry = agentStatusByWorktreePath[worktreePath] else { return }