Add keyboard control for a dealer working on a laptop

The phone got gestures a few rounds back; the desktop still had a mouse and
nothing else. On a bar that gets tapped thirty times a hand, moving a hand to
the trackpad between every decision is the slow part.

F folds, C checks or calls, R opens the raise pad, A shoves, Enter confirms a
raise or moves the hand on, Esc backs out, U takes the last action back. Each
button wears its key in the corner, hidden on touch devices where it would just
be clutter on a button being tapped anyway.

The shortcuts press the same buttons a dealer would tap rather than calling the
betting engine themselves, so there's no second code path to drift out of step
with what the bar is actually offering — if a button isn't on screen, its key
does nothing.

Nothing fires while a name, amount or note is being typed, or while an overlay
owns the keyboard. Typing "Francesca" into a seat name must not fold the table.

Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_015bnp7xKUPFFSpwkYNFaPgb

JoshHeaps.Net/wwwroot/js/casino/holdem/actionBar.js

@@ -194,6 +194,19 @@ const ActionBar = {
         );
     },
 
+    // Which key presses each button. Shown on the button itself and hidden on touch
+    // devices — a shortcut nobody can discover may as well not exist, and a key badge
+    // on a phone is just clutter.
+    KEY_HINTS: {
+        actionFold: "F",
+        actionCheck: "C",
+        actionCall: "C",
+        actionRaise: "R",
+        actionAdvance: "↵",
+        raiseConfirm: "↵",
+        raiseCancel: "esc",
+    },
+
     button(label, className, onClick, sublabel) {
         const btn = document.createElement("button");
         btn.type = "button";
@@ -204,6 +217,14 @@ const ActionBar = {
         main.textContent = label;
         btn.appendChild(main);
 
+        const hint = this.KEY_HINTS[className];
+        if (hint) {
+            const kbd = document.createElement("kbd");
+            kbd.className = "actionKey";
+            kbd.textContent = hint;
+            btn.appendChild(kbd);
+        }
+
         if (sublabel) {
             const sub = document.createElement("span");
             sub.className = "actionBtnSub";