feat: add keyboard shortcuts for calculator commands

samples/dev/index.html

@@ -213,7 +213,7 @@
       <input id="input" class="hidden-input" type="text" autocomplete="off" aria-hidden="true" tabindex="-1">
 
       <div class="input-row">
-        <div class="hint">Keyboard works globally: digits, numpad, Enter, Backspace, Delete, →, +, -, *, /, %, ^</div>
+        <div class="hint">Keyboard works globally: digits, numpad, Enter, Backspace, Delete, →, +, -, *, /, %, ^, q, n, r, i, g, l, s, c, t, S, C, T</div>
         <select id="angleMode">
           <option value="deg">Degrees</option>
           <option value="rad">Radians</option>
@@ -412,6 +412,18 @@
         '/': { type: 'command', value: 'div' },
         '%': { type: 'command', value: 'mod' },
         '^': { type: 'command', value: 'pow' },
+        q: { type: 'command', value: 'sqr' },
+        n: { type: 'command', value: 'neg' },
+        r: { type: 'command', value: 'sqrt' },
+        i: { type: 'command', value: 'recip' },
+        g: { type: 'command', value: 'log' },
+        l: { type: 'command', value: 'ln' },
+        s: { type: 'command', value: 'sin' },
+        c: { type: 'command', value: 'cos' },
+        t: { type: 'command', value: 'tan' },
+        S: { type: 'command', value: 'asin' },
+        C: { type: 'command', value: 'acos' },
+        T: { type: 'command', value: 'atan' },
       };
 
       return keyMap[event.key] || null;