Mental Force becomes castable: the destination step it never got

The card prints no LOS and the engine asks none — but the client never
offered the two-step flow (click the victim, then click where they go),
so every cast arrived without a destination and was refused. It joins
teleport-opponent and shift-wand in the destination gate, with a hint
naming the three-space walk limit and the no-sight freedom.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0138A8CjeQRpvzKxuMfz1Bqc

packages/web/src/App.svelte

@@ -814,7 +814,8 @@
       }
       return;
     }
-    if (selectedCard.cardId === "teleport-opponent" || selectedCard.cardId === "shift-wand") {
+    if (selectedCard.cardId === "teleport-opponent" || selectedCard.cardId === "shift-wand" ||
+        selectedCard.cardId === "mental-force") {
       pendingCellFor = playerId;
       return; // next: click the destination cell
     }
@@ -1814,6 +1815,10 @@
           {/if}
           {#if selectedDef}
             <strong class="hint-name">{selectedDef.name}</strong>
+            {#if pendingCellFor}
+              <span>— now click where {pendingCellFor} goes{selectedCard?.cardId === "mental-force"
+                ? " (within three walked spaces of them — no sight needed)" : ""}</span>
+            {/if}
             {#if selectedCard && EDGE_CARDS.has(selectedCard.cardId)}
               <span>— {EDGE_HINTS[selectedCard.cardId] ?? "click a wall line"}</span>
             {/if}