TASK 20 step 2: hotkey config UI + modifier chord persistence + conflict detection

ViewModels/MainViewModel.cs

@@ -158,6 +158,9 @@ public class MainViewModel : ViewModelBase
     private bool _brandFlashEnabled = true;
     private bool _brandFlashActive;
 
+    // TASK 20 step 2 — hotkey bindings (custom chord per action)
+    private Dictionary<HotkeyId, HotkeyChord> _hotkeyBindings = new();
+
     // TASK 10 — Polar license validation
     private string _licenseKey = string.Empty;
     private string _licenseMessage = string.Empty;
@@ -352,6 +355,15 @@ public class MainViewModel : ViewModelBase
 
     // ─── Global hotkeys (TASK 20) — dispatch a registered hotkey to its action ───
 
+    /// <summary>
+    /// Callback set by MainWindow so the VM can trigger hotkey re-registration
+    /// after the user saves custom bindings from the config dialog.
+    /// </summary>
+    public Action<Dictionary<HotkeyId, HotkeyChord>>? HotkeyBindingsChanged { get; set; }
+
+    /// <summary>The current hotkey bindings (loaded from DB, updated on dialog save).</summary>
+    public Dictionary<HotkeyId, HotkeyChord> CurrentHotkeyBindings => _hotkeyBindings;
+
     public void HandleHotkey(Services.HotkeyId id)
     {
         switch (id)
@@ -383,6 +395,18 @@ public class MainViewModel : ViewModelBase
         if (scene != null) TransitionToScene(scene);
     }
 
+    private void OpenHotkeyConfig()
+    {
+        var vm = new HotkeyConfigViewModel(_layoutStore);
+        var dialog = new HotkeyConfigDialog(vm) { Owner = Application.Current.MainWindow };
+        if (dialog.ShowDialog() == true)
+        {
+            // Reload bindings from DB (the dialog already saved them).
+            _hotkeyBindings = _layoutStore.LoadHotkeyBindings();
+            HotkeyBindingsChanged?.Invoke(_hotkeyBindings);
+        }
+    }
+
     /// <summary>
     /// Right-click-on-preview → "Show Webcam": offered when the active scene has no
     /// webcam config (add one) or hides it (unhide — keeps the config row).
@@ -1485,6 +1509,7 @@ public class MainViewModel : ViewModelBase
     public ICommand OpenLayoutCommand { get; }
     public ICommand ActivateLicenseCommand { get; }
     public ICommand OpenLicenseEntryCommand { get; }
+    public ICommand OpenHotkeyConfigCommand { get; }
 
     public MainViewModel()
     {
@@ -1558,10 +1583,14 @@ public class MainViewModel : ViewModelBase
         OpenLayoutCommand = new RelayCommand(_ => OpenLayoutFile());
         ActivateLicenseCommand = new RelayCommand(_ => _ = ActivateLicenseAsync(), _ => !IsLicenseValidating);
         OpenLicenseEntryCommand = new RelayCommand(_ => IsLicenseEntryOpen = !IsLicenseEntryOpen);
+        OpenHotkeyConfigCommand = new RelayCommand(_ => OpenHotkeyConfig());
 
         _layoutStore = new LayoutStore(LayoutPathOverride ?? DefaultLayoutPath);
         _activeLayoutPath = _layoutStore.ActivePath;
 
+        // Load saved hotkey bindings (filled with defaults for any unbound actions).
+        _hotkeyBindings = _layoutStore.LoadHotkeyBindings();
+
         BroadcastForm = new Services.LiveBroadcastFormViewModel(
             () => _layoutStore,
             () => _youtubeStream,