Add project files.

ClipForge/GlobalHotkeyService.cs

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+using System;
+using System.Runtime.InteropServices;
+using Microsoft.UI.Xaml;
+
+namespace ClipForge
+{
+    public class GlobalHotkeyService
+    {
+        // These two lines talk directly to Windows to register/unregister hotkeys
+        [DllImport("user32.dll")]
+        private static extern bool RegisterHotKey(IntPtr hWnd, int id, uint fsModifiers, uint vk);
+
+        [DllImport("user32.dll")]
+        private static extern bool UnregisterHotKey(IntPtr hWnd, int id);
+
+        // This is the ID we'll use to identify our clip hotkey
+        private const int HOTKEY_CLIP = 1;
+
+        // Alt key modifier
+        private const uint MOD_ALT = 0x0001;
+
+        // F9 key
+        private const uint VK_F9 = 0x78;
+
+        // This is the "event" that fires when the hotkey is pressed
+        public event Action? ClipRequested;
+
+        private IntPtr _hwnd;
+
+        public void Initialize(IntPtr hwnd)
+        {
+            _hwnd = hwnd;
+            RegisterHotKey(_hwnd, HOTKEY_CLIP, MOD_ALT, VK_F9);
+        }
+
+        public void ProcessHotkey(int id)
+        {
+            if (id == HOTKEY_CLIP)
+            {
+                ClipRequested?.Invoke();
+            }
+        }
+
+        public void Cleanup()
+        {
+            UnregisterHotKey(_hwnd, HOTKEY_CLIP);
+        }
+    }
+}