feat(ads/seo/release): v1.2.0 with live Google Ads, isolated ad profile, ads.txt, and SEO/AEO/GEO optimization

tests/Paca.Tests/App/GlobalHotkeyGateTests.cs

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+using System;
+using System.Windows.Input;
+using Paca.App.Core;
+using Xunit;
+
+namespace Paca.Tests.App;
+
+public class GlobalHotkeyGateTests
+{
+    [Fact]
+    public void Gate257_GlobalHotkeyParser_ParsesKeyModifiers()
+    {
+        var success = GlobalHotkeyParser.TryParse("Ctrl+Shift+D", out var modifiers, out var key);
+
+        Assert.True(success);
+        Assert.Equal(ModifierKeys.Control | ModifierKeys.Shift, modifiers);
+        Assert.Equal(Key.D, key);
+    }
+
+    [Fact]
+    public void Gate258_GlobalHotkeyParser_ParsesAlternativeShortcut()
+    {
+        var success = GlobalHotkeyParser.TryParse("Ctrl+Alt+V", out var modifiers, out var key);
+
+        Assert.True(success);
+        Assert.Equal(ModifierKeys.Control | ModifierKeys.Alt, modifiers);
+        Assert.Equal(Key.V, key);
+    }
+
+    [Fact]
+    public void Gate259_GlobalHotkeyManager_CalculatesWin32ModFlags()
+    {
+        var modFlags = GlobalHotkeyManager.GetWin32ModifierFlags(ModifierKeys.Control | ModifierKeys.Shift);
+        
+        // MOD_CONTROL = 0x0002, MOD_SHIFT = 0x0004 -> 0x0006
+        Assert.Equal(0x0006u, modFlags);
+
+        var altWin = GlobalHotkeyManager.GetWin32ModifierFlags(ModifierKeys.Alt | ModifierKeys.Windows);
+        // MOD_ALT = 0x0001, MOD_WIN = 0x0008 -> 0x0009
+        Assert.Equal(0x0009u, altWin);
+    }
+
+    [Fact]
+    public void Gate260_GlobalHotkeyManager_HotkeyTrigger_InvokesCallback()
+    {
+        var manager = new GlobalHotkeyManager();
+        bool triggered = false;
+
+        manager.RegisterVirtualHotkey("Ctrl+Shift+D", () => triggered = true);
+
+        // Simulate trigger
+        manager.SimulateHotkeyTrigger("Ctrl+Shift+D");
+
+        Assert.True(triggered);
+    }
+}