Let the dealer take back an action from the bar

An audit of what's accumulated turned up an inconsistency worth fixing: double-
tapping a seat to fold someone was undoable, but tapping Fold in the action bar
— the button a dealer actually uses all hand — was not. Nor was Call, Raise, or
dealing a street. The safest path through the tool was the shortcut, and the
main one had no way back.

Every action taken from the bar now goes through one place that records it
first, and the bar carries a standing Undo naming what it will take back:
"Ben's fold", "dealing the flop". Twelve steps deep, because a misclick usually
gets noticed a beat late and one level of undo would only cover the luckiest
case.

It's a control rather than a toast per action. A dealer taps this bar
constantly, and a toast after every fold is noise they'd learn to ignore —
which is precisely when they'd miss the one that mattered.

The history is discarded whenever a hand starts or settles, because those
snapshots describe a hand that no longer exists. The whole-hand Undo on the
toast already covers that boundary.

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

JoshHeaps.Net/wwwroot/css/casino/holdem.css

@@ -1075,12 +1075,37 @@ body.hasActionBar #holdemSidebar {
 
 .actionStatus {
     display: flex;
+    flex-wrap: wrap;
     align-items: baseline;
-    gap: 0.6rem;
+    gap: 0.4rem 0.6rem;
     margin-bottom: 0.55rem;
     font-size: 0.78rem;
 }
 
+/* Always there while there's something to take back, rather than a toast per tap. */
+.actionUndo {
+    flex: none;
+    min-height: 30px;
+    max-width: 100%;
+    padding: 0.15rem 0.6rem;
+    border-radius: 999px;
+    border: 1px solid #414141;
+    background: #262626;
+    color: #bdbdbd;
+    font-family: inherit;
+    font-size: 0.72rem;
+    cursor: pointer;
+    overflow: hidden;
+    text-overflow: ellipsis;
+    white-space: nowrap;
+}
+
+.actionUndo:hover {
+    background: #333;
+    border-color: #4f4f4f;
+    color: #eee;
+}
+
 .actionStreet {
     color: #d8b46a;
     font-weight: 600;