Input: Refactor Keyboard Handling To Use Physical Keys (#13)

This PR refactors keyboard handling to use physical key mappings for all gameplay input, ensuring controls remain consistent across different OS keyboard layouts.
I'd like to give out an ENORMOUS thank you to @Neo for his very generous help on getting MacOS caps lock behaviour working, but as well for taking the time for extensive testing, planning and discussions, and finally for writing this PR message :) Keep being awsome pal 👊

### New Features :
* **New**: Gameplay input now uses physical key positions instead of OS layouts, ensuring the same physical key triggers the same action across keyboard layouts.
    * Key rebinding stores physical keys and config compatibility is preserved, with physical keys now the primary gameplay‑binding format.
    * Physical‑key model is now consistent across platforms, including updated SDL/headless behavior.
* **Added**: New Input setting "Reset keybinds to default", with a new confirmation dialog appears when changes are being overwritten.
* **Fractured**: Keyboard‑related locales to the newly created `KeyboardLayout.json`.
    * New input device settings/actions use clearer labels and tooltips.
    * UI Key Labels (such as Left Shift and Right Shift) are more accurate and standardized, with clearer symbols, consistent naming, dynamic learning of printable labels from real key events, and persistence across restarts.
### Improvements :
* **Reduced**: Incorrect key labels by using observed host symbols instead of language assumptions.
* **Reduced**: Stuck/stale keys by using binary pressed‑key tracking, fixing rebinding/gameplay paths, better held‑key recovery after focus changes, and clearing keyboard state when Ryujinx/settings windows lose focus.
* **Improved**: Device handling → refreshing no longer clears the selector, disconnect fallback is consistent, reconnect restores controllers automatically, and the UI avoids invalid/empty device states.
* **Improved**: Async input‑assignment callbacks are now guarded when switching views/devices, preventing stale callbacks from hitting detached views.
* **Adjusted**: Input visualiser to be more robust when switching sources or handling controller disconnect/reconnect, without needing to reopen settings.
* **Improved**: Modification (changes to input controls) tracking
    * Rebinding to the same value, reverting to original config, restoring defaults without differences, or reloading equivalent profiles no longer leaves Player marked as modified.
* **Reduced**: Keyboard LED noise in logs and added optional UI keyboard‑state/rebinding diagnostics.
### Fixes :
* **Special Keys**:
    * AltGr and other special keys behave correctly, including proper Ctrl+Alt → AltRight handling and more consistent normalization of special/synthetic keys.
    * Caps Lock is now reliably bindable on all platforms (Windows/Linux register every press; macOS every other).
* **Fixed**: Certain cases where keyboard input broke after pointer interactions
### Current Limitations

These are planned on being fixed/improved upon in future PRs:
* Hotkeys still use semantic (Key) mappings.
* Software keyboard / text input still uses the semantic path
* Printable key labels may fall back to defaults until observed from host input.
* Full semantic/physical split currently implemented only in the Avalonia driver.

Co-authored-by: _Neo_ <ursamajorjanus2819@gmail.com>
Reviewed-on: https://git.ryujinx.app/projects/Ryubing/pulls/13

src/Ryujinx/Input/AvaloniaKeyboardMappingHelper.cs

@@ -2,6 +2,7 @@ using Ryujinx.Input;
 using System;
 using System.Collections.Generic;
 using AvaKey = Avalonia.Input.Key;
+using AvaPhysicalKey = Avalonia.Input.PhysicalKey;
 
 namespace Ryujinx.Ava.Input
 {
@@ -132,7 +133,8 @@ namespace Ryujinx.Ava.Input
             AvaKey.D8,
             AvaKey.D9,
             AvaKey.OemTilde,
-            AvaKey.OemTilde,AvaKey.OemMinus,
+            AvaKey.Oem102,
+            AvaKey.OemMinus,
             AvaKey.OemPlus,
             AvaKey.OemOpenBrackets,
             AvaKey.OemCloseBrackets,
@@ -147,7 +149,149 @@ namespace Ryujinx.Ava.Input
             AvaKey.None
         ];
 
+        private static readonly AvaPhysicalKey[] _physicalKeyMapping =
+        [
+            // NOTE: Invalid
+            AvaPhysicalKey.None,
+
+            AvaPhysicalKey.ShiftLeft,
+            AvaPhysicalKey.ShiftRight,
+            AvaPhysicalKey.ControlLeft,
+            AvaPhysicalKey.ControlRight,
+            AvaPhysicalKey.AltLeft,
+            AvaPhysicalKey.AltRight,
+            AvaPhysicalKey.MetaLeft,
+            AvaPhysicalKey.MetaRight,
+            AvaPhysicalKey.ContextMenu,
+            AvaPhysicalKey.F1,
+            AvaPhysicalKey.F2,
+            AvaPhysicalKey.F3,
+            AvaPhysicalKey.F4,
+            AvaPhysicalKey.F5,
+            AvaPhysicalKey.F6,
+            AvaPhysicalKey.F7,
+            AvaPhysicalKey.F8,
+            AvaPhysicalKey.F9,
+            AvaPhysicalKey.F10,
+            AvaPhysicalKey.F11,
+            AvaPhysicalKey.F12,
+            AvaPhysicalKey.F13,
+            AvaPhysicalKey.F14,
+            AvaPhysicalKey.F15,
+            AvaPhysicalKey.F16,
+            AvaPhysicalKey.F17,
+            AvaPhysicalKey.F18,
+            AvaPhysicalKey.F19,
+            AvaPhysicalKey.F20,
+            AvaPhysicalKey.F21,
+            AvaPhysicalKey.F22,
+            AvaPhysicalKey.F23,
+            AvaPhysicalKey.F24,
+
+            AvaPhysicalKey.None,
+            AvaPhysicalKey.None,
+            AvaPhysicalKey.None,
+            AvaPhysicalKey.None,
+            AvaPhysicalKey.None,
+            AvaPhysicalKey.None,
+            AvaPhysicalKey.None,
+            AvaPhysicalKey.None,
+            AvaPhysicalKey.None,
+            AvaPhysicalKey.None,
+            AvaPhysicalKey.None,
+
+            AvaPhysicalKey.ArrowUp,
+            AvaPhysicalKey.ArrowDown,
+            AvaPhysicalKey.ArrowLeft,
+            AvaPhysicalKey.ArrowRight,
+            AvaPhysicalKey.Enter,
+            AvaPhysicalKey.Escape,
+            AvaPhysicalKey.Space,
+            AvaPhysicalKey.Tab,
+            AvaPhysicalKey.Backspace,
+            AvaPhysicalKey.Insert,
+            AvaPhysicalKey.Delete,
+            AvaPhysicalKey.PageUp,
+            AvaPhysicalKey.PageDown,
+            AvaPhysicalKey.Home,
+            AvaPhysicalKey.End,
+            AvaPhysicalKey.CapsLock,
+            AvaPhysicalKey.ScrollLock,
+            AvaPhysicalKey.PrintScreen,
+            AvaPhysicalKey.Pause,
+            AvaPhysicalKey.NumLock,
+            AvaPhysicalKey.NumPadClear,
+            AvaPhysicalKey.NumPad0,
+            AvaPhysicalKey.NumPad1,
+            AvaPhysicalKey.NumPad2,
+            AvaPhysicalKey.NumPad3,
+            AvaPhysicalKey.NumPad4,
+            AvaPhysicalKey.NumPad5,
+            AvaPhysicalKey.NumPad6,
+            AvaPhysicalKey.NumPad7,
+            AvaPhysicalKey.NumPad8,
+            AvaPhysicalKey.NumPad9,
+            AvaPhysicalKey.NumPadDivide,
+            AvaPhysicalKey.NumPadMultiply,
+            AvaPhysicalKey.NumPadSubtract,
+            AvaPhysicalKey.NumPadAdd,
+            AvaPhysicalKey.NumPadDecimal,
+            AvaPhysicalKey.NumPadEnter,
+            AvaPhysicalKey.A,
+            AvaPhysicalKey.B,
+            AvaPhysicalKey.C,
+            AvaPhysicalKey.D,
+            AvaPhysicalKey.E,
+            AvaPhysicalKey.F,
+            AvaPhysicalKey.G,
+            AvaPhysicalKey.H,
+            AvaPhysicalKey.I,
+            AvaPhysicalKey.J,
+            AvaPhysicalKey.K,
+            AvaPhysicalKey.L,
+            AvaPhysicalKey.M,
+            AvaPhysicalKey.N,
+            AvaPhysicalKey.O,
+            AvaPhysicalKey.P,
+            AvaPhysicalKey.Q,
+            AvaPhysicalKey.R,
+            AvaPhysicalKey.S,
+            AvaPhysicalKey.T,
+            AvaPhysicalKey.U,
+            AvaPhysicalKey.V,
+            AvaPhysicalKey.W,
+            AvaPhysicalKey.X,
+            AvaPhysicalKey.Y,
+            AvaPhysicalKey.Z,
+            AvaPhysicalKey.Digit0,
+            AvaPhysicalKey.Digit1,
+            AvaPhysicalKey.Digit2,
+            AvaPhysicalKey.Digit3,
+            AvaPhysicalKey.Digit4,
+            AvaPhysicalKey.Digit5,
+            AvaPhysicalKey.Digit6,
+            AvaPhysicalKey.Digit7,
+            AvaPhysicalKey.Digit8,
+            AvaPhysicalKey.Digit9,
+            AvaPhysicalKey.Backquote,
+            AvaPhysicalKey.IntlBackslash,
+            AvaPhysicalKey.Minus,
+            AvaPhysicalKey.Equal,
+            AvaPhysicalKey.BracketLeft,
+            AvaPhysicalKey.BracketRight,
+            AvaPhysicalKey.Semicolon,
+            AvaPhysicalKey.Quote,
+            AvaPhysicalKey.Comma,
+            AvaPhysicalKey.Period,
+            AvaPhysicalKey.Slash,
+            AvaPhysicalKey.Backslash,
+
+            // NOTE: invalid
+            AvaPhysicalKey.None
+        ];
+
         private static readonly Dictionary<AvaKey, Key> _avaKeyMapping;
+        private static readonly Dictionary<AvaPhysicalKey, Key> _avaPhysicalKeyMapping;
 
         static AvaloniaKeyboardMappingHelper()
         {
@@ -155,21 +299,42 @@ namespace Ryujinx.Ava.Input
 
             // NOTE: Avalonia.Input.Key is not contiguous and quite large, so use a dictionary instead of an array.
             _avaKeyMapping = new Dictionary<AvaKey, Key>();
+            _avaPhysicalKeyMapping = new Dictionary<AvaPhysicalKey, Key>();
 
             foreach (Key key in inputKeys)
             {
-                if (TryGetAvaKey(key, out AvaKey index))
+                if (TryGetAvaKey(key, out AvaKey avaKey))
                 {
-                    _avaKeyMapping[index] = key;
+                    _avaKeyMapping[avaKey] = key;
+                }
+
+                if (TryGetAvaPhysicalKey(key, out AvaPhysicalKey avaPhysicalKey))
+                {
+                    _avaPhysicalKeyMapping[avaPhysicalKey] = key;
                 }
             }
+
+            // Alias additional Avalonia key values to improve non-US layout support.
+            _avaKeyMapping[AvaKey.Oem1] = Key.Semicolon;
+            _avaKeyMapping[AvaKey.Oem2] = Key.Slash;
+            _avaKeyMapping[AvaKey.Oem3] = Key.Tilde;
+            _avaKeyMapping[AvaKey.Oem4] = Key.BracketLeft;
+            _avaKeyMapping[AvaKey.Oem5] = Key.BackSlash;
+            _avaKeyMapping[AvaKey.Oem6] = Key.BracketRight;
+            _avaKeyMapping[AvaKey.Oem7] = Key.Quote;
+            _avaKeyMapping[AvaKey.OemBackslash] = Key.Grave;
+            _avaKeyMapping[AvaKey.Oem102] = Key.Grave;
+
+            // Common alternates for non-US/JIS physical keys.
+            _avaPhysicalKeyMapping[AvaPhysicalKey.IntlRo] = Key.BackSlash;
+            _avaPhysicalKeyMapping[AvaPhysicalKey.IntlYen] = Key.BackSlash;
         }
 
         public static bool TryGetAvaKey(Key key, out AvaKey avaKey)
         {
             avaKey = AvaKey.None;
 
-            bool keyExist = (int)key < _keyMapping.Length;
+            bool keyExist = key < Key.Count && (int)key < _keyMapping.Length;
             if (keyExist)
             {
                 avaKey = _keyMapping[(int)key];
@@ -178,9 +343,34 @@ namespace Ryujinx.Ava.Input
             return keyExist;
         }
 
+        public static bool TryGetAvaPhysicalKey(Key key, out AvaPhysicalKey avaPhysicalKey)
+        {
+            avaPhysicalKey = AvaPhysicalKey.None;
+
+            bool keyExist = key < Key.Count && (int)key < _physicalKeyMapping.Length;
+            if (keyExist)
+            {
+                avaPhysicalKey = _physicalKeyMapping[(int)key];
+            }
+
+            return keyExist;
+        }
+
         public static Key ToInputKey(AvaKey key)
         {
             return _avaKeyMapping.GetValueOrDefault(key, Key.Unknown);
         }
+
+        public static Key ToInputKey(AvaPhysicalKey key)
+        {
+            return _avaPhysicalKeyMapping.GetValueOrDefault(key, Key.Unknown);
+        }
+
+        public static Key ToInputKey(AvaPhysicalKey physicalKey, AvaKey key)
+        {
+            Key inputKey = ToInputKey(key);
+
+            return inputKey != Key.Unknown ? inputKey : ToInputKey(physicalKey);
+        }
     }
 }