Enhance grave modifier key support and fix missing key definitions

- Add missing grave key definitions in KeySequence class
- Improve key type mapping for grave modifier
- Ensure consistent grave modifier behavior across GUI and core

🤖 Generated with [Claude Code](https://claude.ai/code)

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

src/gui/src/KeySequence.cpp

@@ -139,6 +139,19 @@ bool KeySequence::appendKey(int key, int modifiers)
             }
             break;
 
+        case Qt::Key_QuoteLeft:
+            {
+                printf("GRAVE DEBUG: Qt::Key_QuoteLeft detected in GUI\n");
+                int mod = GraveModifier & (~m_Modifiers);
+                if (mod)
+                {
+                    printf("GRAVE DEBUG: Adding GraveModifier to sequence: %08x\n", mod);
+                    m_Sequence.append(mod);
+                    m_Modifiers |= mod;
+                }
+            }
+            break;
+
         default:
             // see if we can handle this key, if not, don't accept it
             if (keyToString(key).isEmpty())
@@ -210,6 +223,9 @@ QString KeySequence::keyToString(int key)
     if (key & Qt::MetaModifier)
         return "Meta";
 
+    if (key & GraveModifier)
+        return "Grave";
+
     // treat key pad like normal keys (FIXME: we should have another lookup table for keypad keys instead)
      key &= ~Qt::KeypadModifier;
 

src/gui/src/KeySequence.h

@@ -25,6 +25,9 @@
 
 class QSettings;
 
+// Custom modifier for grave key (not supported by Qt)
+static const int GraveModifier = 0x20000000;
+
 class KeySequence
 {
     public:

src/lib/barrier/key_types.cpp

@@ -209,6 +209,7 @@ const KeyModifierNameMapEntry kModifierNameMap[] = {
     { "AltGr",            KeyModifierAltGr },
 //    { "CapsLock",        KeyModifierCapsLock },
     { "Control",        KeyModifierControl },
+    { "Grave",            KeyModifierGrave },
     { "Meta",            KeyModifierMeta },
 //    { "NumLock",        KeyModifierNumLock },
 //    { "ScrollLock",        KeyModifierScrollLock },

src/lib/barrier/key_types.h

@@ -58,6 +58,7 @@ static const KeyModifierMask	KeyModifierMeta       = 0x0008;
 static const KeyModifierMask	KeyModifierSuper      = 0x0010;
 static const KeyModifierMask	KeyModifierAltGr      = 0x0020;
 static const KeyModifierMask	KeyModifierLevel5Lock = 0x0040;
+static const KeyModifierMask	KeyModifierGrave      = 0x0080;
 static const KeyModifierMask	KeyModifierCapsLock   = 0x1000;
 static const KeyModifierMask	KeyModifierNumLock    = 0x2000;
 static const KeyModifierMask	KeyModifierScrollLock = 0x4000;
@@ -73,6 +74,7 @@ static const UInt32				kKeyModifierBitMeta       = 3;
 static const UInt32				kKeyModifierBitSuper      = 4;
 static const UInt32				kKeyModifierBitAltGr      = 5;
 static const UInt32				kKeyModifierBitLevel5Lock = 6;
+static const UInt32				kKeyModifierBitGrave      = 7;
 static const UInt32				kKeyModifierBitCapsLock   = 12;
 static const UInt32				kKeyModifierBitNumLock    = 13;
 static const UInt32				kKeyModifierBitScrollLock = 14;
@@ -88,7 +90,8 @@ static const KeyModifierID		kKeyModifierIDAlt      = 3;
 static const KeyModifierID		kKeyModifierIDMeta     = 4;
 static const KeyModifierID		kKeyModifierIDSuper    = 5;
 static const KeyModifierID		kKeyModifierIDAltGr    = 6;
-static const KeyModifierID		kKeyModifierIDLast     = 7;
+static const KeyModifierID		kKeyModifierIDGrave    = 7;
+static const KeyModifierID		kKeyModifierIDLast     = 8;
 //@}
 
 //! @name Key identifiers