Auto-grab asks before pocketing your own treasure

Walking off a square holding your own chest is the capture clause's
favorite setup, so the end-turn caution now names it before the
auto-grab preference takes it.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_015RCWSTnb1KYTPyL4GmhGnF

packages/web/src/App.svelte

@@ -1045,6 +1045,13 @@
           here !== cellKey(me.home)) {
         reasons.push(`a treasure lies at your feet, un-grabbed`);
       }
+      // Auto-grab about to pocket your OWN chest: carrying it does not
+      // score and bares it to capture, so that walk-off asks first.
+      if (autoWillGrab && !me.carriedTreasureId && !view.turn.actionsEnded &&
+          !weakened && !view.gluedCells[here] && !safed && here !== cellKey(me.home) &&
+          treasuresHere[0]!.owner === view.you) {
+        reasons.push("your OWN treasure lies underfoot — ending the turn grabs it and carries it along");
+      }
       // The draw picker is sticky: a 0 or 1 chosen turns ago quietly starves.
       const drawRoom = Math.min(2, room);
       if (drawCount < drawRoom) {