docs: update calc-02 shortcut reference and key mappings

.memory/project.md

@@ -1,6 +1,6 @@
 # State
 - Core engine: `src/rpn-calculator.js`
-- Reference demo: `samples/calc-02/` (portrait-first HP48GX layout, compact mode/constants popups; Const button comes before Mode in the display row)
+- Reference demo: `samples/calc-02/` (portrait-first HP48GX layout; calc-02 keyboard shortcuts are the reference; compact mode/constants popups; Const button comes before Mode in the display row)
 - Important UI behavior: mode button shows the current angle mode; keyboard focus stays on the hidden input on desktop; clipboard paste is supported
 - Note: keep scrolling behavior in mind for the calc-02 demo when changing the stack/UI layout
 - Public API: `push`, `pop`, `clear`, `swap`, `remove`, `edit`, `isValidIndex`, `input`, `command`, `getOperationsByCategory`, `getConstants`, `listConstants`, `setConstant`, `removeConstant`, `hasConstant`

README.md

@@ -275,12 +275,15 @@ The current demo supports:
 - `Escape`
 - `ArrowUp`, `ArrowDown`, `ArrowRight`
 - `+`, `-`, `*`, `/`, `%`, `^`
-- `q`, `n`, `r`, `i`, `g`, `l`, `s`, `c`, `S`, `C`
-- `x`, `y`, `z`, `t`
+- `s`, `S`, `r`, `R`, `v`, `u`
+- `l`, `L`, `n`, `N`, `e`, `E`
+- `i`, `o`, `a`, `I`, `O`, `A`
 
 The demo also implements stack selection and stack-item move mode in its UI layer using the public calculator methods.
 It keeps the calculator screen focused and updates the visible stack window as the selection moves.
 
+Note: `calc-02` keyboard shortcuts are the reference for this project.
+
 ## Exports
 
 `RpnCalculator` is exposed in both environments:

samples/calc-02/index.js

@@ -336,6 +336,24 @@ function handleKeyboard(event) {
 		'/': 'div',
 		'%': 'mod',
 		'^': 'pow',
+		s: 'sqr',
+		S: 'pow',
+		r: 'sqrt',
+		R: 'root',
+		v: 'recip',
+		u: 'pow10',
+		l: 'log',
+		L: 'log',
+		n: 'ln',
+		N: 'ln',
+		e: 'exp',
+		E: 'exp',
+		i: 'sin',
+		o: 'cos',
+		a: 'tan',
+		I: 'asin',
+		O: 'acos',
+		A: 'atan',
 	};
 	if (key === 'ArrowLeft') {
 		event.preventDefault();
@@ -470,7 +488,7 @@ const constantLabels = {
 	e: 'e',
 	phi: 'φ',
 	g: 'g',
-	c: 'c',
+	c: 'C',
 };
 const constantOrder = ['pi', 'e', 'phi', 'g', 'c'];