Numpad keys and GLFW bracket/grave names never match across frameworks: Ctrl+Keypad1 (ImGui), Ctrl+KP_1 (GLFW) and Ctrl+NumPad1 (WinForms/browser) are three different chords #244

What's wrong

Note.CanonicalizeKey (Keybinding/Models/MusicalTypes.cs:72-146, main @ 842853f) folds each framework's names for modifiers, main-row digits, navigation keys and (since #235) GLFW's multi-word names like PAGE_UP. The numpad keys and several other GLFW names were left out, so the same physical key gets a different canonical name depending on which host produced it. The comments at lines 74-75 and 107 deliberately keep numpad keys distinct from the main row — that part is right — but nothing folds the numpad's own names into one.

Repro (net10.0)

void S(string a,string b){Chord x=Chord.Parse(a),y=Chord.Parse(b);Console.WriteLine($"{x} vs {y} {x.Equals(y)}");}
S("LeftCtrl+Keypad1","Ctrl+NumPad1");          // ImGui/Silk.NET vs WinForms/WPF/browser
S("LEFT_CONTROL+KP_1","Ctrl+NumPad1");         // GLFW
S("LeftCtrl+KeypadAdd","Ctrl+Add");
S("LEFT_CONTROL+KP_ENTER","Ctrl+KeypadEnter");
S("LEFT_CONTROL+LEFT_BRACKET","Ctrl+LeftBracket");
S("LEFT_CONTROL+GRAVE_ACCENT","Ctrl+GraveAccent");
S("LEFT_CONTROL+PAGE_UP","Ctrl+PageUp");       // control, fixed by #235

Output:

Ctrl+KEYPAD1 vs Ctrl+NUMPAD1 False
Ctrl+KP_1 vs Ctrl+NUMPAD1 False
Ctrl+KEYPADADD vs Ctrl+ADD False
Ctrl+KP_ENTER vs Ctrl+KEYPADENTER False
Ctrl+LEFT_BRACKET vs Ctrl+LEFTBRACKET False
Ctrl+GRAVE_ACCENT vs Ctrl+GRAVEACCENT False
Ctrl+PAGEUP vs Ctrl+PAGEUP True

Why it matters

A binding stored as Ctrl+NumPad1 from a WinForms/WPF/browser front end never fires from an ImGui/Silk.NET host (Keypad1) or a GLFW host (KP_1), and the UI shows raw names like KP_1 and LEFT_BRACKET. That is the cross-framework mismatch #205/#224/#235 fixed for other keys. Not covered by #197 (numpad vs main row) or #218 (browser KeyS/Digit1).

Suggested fix

Fold every framework's name for one numpad key to a single canonical name, still separate from the main row:

• KEYPAD<x> and KP_<x> → NUMPAD<x>, for digits and ADD, SUBTRACT, MULTIPLY, DIVIDE, DECIMAL, ENTER, EQUAL.
• Bare WinForms ADD/SUBTRACT/MULTIPLY/DIVIDE/DECIMAL → NUMPAD<op>.
• LEFT_BRACKET/BRACKETLEFT → LEFTBRACKET, RIGHT_BRACKET/BRACKETRIGHT → RIGHTBRACKET, GRAVE_ACCENT/BACKQUOTE → GRAVEACCENT.

Acceptance: every pair above compares equal in KeyAliasEquivalenceTests, and NumPad1 still differs from D1/Key1.