Initial FocusFixer implementation

Menu-bar utility that fixes cross-display keyboard focus loss: a
listen-only CGEvent tap locates the window under the cursor and
reasserts app activation + AX focus on it, with debounce, tap
auto-recovery, and an Accessibility permission gate.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

FocusFixer/PermissionManager.swift

@@ -0,0 +1,47 @@
+import ApplicationServices
+import Foundation
+import os
+
+/// Requests and polls for the Accessibility (TCC) grant FocusFixer needs
+/// to observe events and drive the AX API.
+final class PermissionManager {
+    private let logger = Logger(subsystem: "com.local.focusfixer", category: "PermissionManager")
+    private var pollTimer: Timer?
+
+    var isTrusted: Bool {
+        AXIsProcessTrusted()
+    }
+
+    /// Shows the system Accessibility prompt (if not already trusted) and
+    /// polls until the grant appears, then calls `onGranted` on the main
+    /// queue. Safe to call repeatedly; a prior poll is cancelled first.
+    func waitUntilTrusted(pollInterval: TimeInterval = 1.0, onGranted: @escaping () -> Void) {
+        stopPolling()
+
+        if isTrusted {
+            onGranted()
+            return
+        }
+
+        let options = [kAXTrustedCheckOptionPrompt.takeUnretainedValue() as String: true] as CFDictionary
+        _ = AXIsProcessTrustedWithOptions(options)
+        logger.info("Accessibility permission not granted yet; prompting and polling")
+
+        pollTimer = Timer.scheduledTimer(withTimeInterval: pollInterval, repeats: true) { [weak self] timer in
+            guard let self else {
+                timer.invalidate()
+                return
+            }
+            guard self.isTrusted else { return }
+            timer.invalidate()
+            self.pollTimer = nil
+            self.logger.info("Accessibility permission granted")
+            onGranted()
+        }
+    }
+
+    func stopPolling() {
+        pollTimer?.invalidate()
+        pollTimer = nil
+    }
+}