[Repo Assist] Fix: notify user when global hotkey registration fails

[github-actions]

🤖 This PR was created by Repo Assist, an automated AI assistant.

Summary

RegisterHotKey() is called for Ctrl+Shift+L, Ctrl+Shift+↑, and Ctrl+Shift+↓ without checking the return value. If another application already holds one of these shortcuts, the call silently returns false and the hotkey stops working with no feedback to the user.

Closes #59

Root Cause

The three RegisterHotKey calls in Window_Loaded discarded their boolean return values. There was no code path to surface a conflict to the user.

Fix

Added a RegisterHotKeyWithFeedback helper that:

1. Checks the return value of RegisterHotKey
2. On the first failure, shows a tray balloon notification (6 seconds) identifying the conflicting shortcut by name
3. Sets _hotkeyWarningShown = true so only one balloon is shown per session — no spam

Trade-offs

• One balloon tip on startup if any hotkey conflicts — unobtrusive and only shown once per session
• No change to actual hotkey behaviour — shortcuts that succeed still work normally
• No new dependencies

Test Status

Step	Result
dotnet build /p:EnableWindowsTargeting=true	✅ 0 errors, 0 warnings

(Cross-compiled on Linux with EnableWindowsTargeting=true required for WPF.)

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Show patch preview (80 of 80 lines)

From 652ecca3bf69966351a8a5d53d31469d80461cf1 Mon Sep 17 00:00:00 2001
From: "github-actions[bot]"
 <41898282+github-actions[bot]@users.noreply.github.com>
Date: Thu, 18 Jun 2026 14:02:17 +0000
Subject: [PATCH] fix: notify user when global hotkey registration fails

RegisterHotKey() is called for Ctrl+Shift+L, Ctrl+Shift+Up, and
Ctrl+Shift+Down without checking the return value. If another app
already owns one of these shortcuts the call silently fails and the
hotkey stops working with no feedback.

Add RegisterHotKeyWithFeedback() helper that:
- Checks the bool returned by RegisterHotKey
- Shows a tray balloon tip on the FIRST failure only (no spam)
- Identifies the conflicting shortcut by name in the tip text
- Logs subsequent failures to Debug only

Build: 0 errors, 0 warnings (net10.0-windows, EnableWindowsTargeting=true)

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
---
 WindowsEdgeLight/MainWindow.xaml.cs | 27 +++++++++++++++++++++++----
 1 file changed, 23 insertions(+), 4 deletions(-)

diff --git a/WindowsEdgeLight/MainWindow.xaml.cs b/WindowsEdgeLight/MainWindow.xaml.cs
index c24a3c7..6435ddf 100644
--- a/WindowsEdgeLight/MainWindow.xaml.cs
+++ b/WindowsEdgeLight/MainWindow.xaml.cs
@@ -134,6 +134,8 @@ public partial class MainWindow : Window
     private IntPtr mouseHookHandle = IntPtr.Zero;
     private LowLevelMouseProc? mouseHookCallback;
 
+    private bool _hotkeyWarningShown = false;
+
     private Rect? frameOuterRect;
     private Rect? frameInnerRect;
     private readonly Ellipse? hoverCursorRing;
@@ -298,10 +300,10 @@ Version {version}";
         int extendedStyle = GetWindowLong(hwnd, GWL_EXSTYLE);
         SetWindowLong(hwnd, GWL_EXSTYLE, extendedStyle | WS_EX_TRANSPARENT | WS_EX_LAYERED);
         
-        // Register global hotkeys
-        RegisterHotKey(hwnd, HOTKEY_TOGGLE, MOD_CONTROL | MOD_SHIFT, VK_L);
-        RegisterHotKey(hwnd, HOTKEY_BRIGHTNESS_UP, MOD_CONTROL | MOD_SHIFT, VK_UP);
-        RegisterHotKey(hwn
... (truncated)

[shanselman]

Closing as a duplicate of #65, which tracks the same global hotkey registration failure notification.