Objects can be set down and picked back up

The engine always knew how — dropObject and pickUpObject were in the
command set from the start — but the table never offered a hand for
it. Now selecting a magic stone (or any object card) on your turn
shows a "Drop it here" button in the hint bar, and standing on a
square with objects lying on it offers a "Pick up <name>" stamp per
object, disabled once your actions have ended (picking anything up
ends them, per the rulebook). The chronicle narrates both.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

packages/web/src/App.svelte

@@ -457,6 +457,11 @@
     view.treasures.some((t) => t.position && t.position.x === me.position.x &&
                                t.position.y === me.position.y && !t.carriedBy),
   );
+  const objectsHere = $derived(
+    view != null && me != null
+      ? (view.groundObjects[`${me.position.x},${me.position.y}`] ?? [])
+      : [],
+  );
   const onWarpToken = $derived(
     view != null && me != null &&
     view.dimWarps.some((w) =>
@@ -907,6 +912,12 @@
                 Cast{attachedNumber ? ` with the ${numberTotal}` : ""}
               </button>
             {/if}
+            {#if selectedCard && selectedDef.cardType === "object" && isYourTurn}
+              <button class="stamp tiny" onclick={() => {
+                if (selectedCard) dispatch({ type: "dropObject", instanceId: selectedCard.instanceId });
+                clearSelection();
+              }}>Drop it here</button>
+            {/if}
             {#if selectedCard && isNumberCard(selectedCard.cardId)}
               <button class="stamp tiny" onclick={playNumberForMovement}>
                 Play for +{cardDef(selectedCard.cardId).value} movement{view.turn.numberPlayedForMovement ? " (uses your Add)" : ""}
@@ -925,6 +936,11 @@
           <button class="stamp" disabled={!treasureHere || carryingTreasure || view.turn.actionsEnded}
             onclick={pickUp}>Pick up treasure</button>
           <button class="stamp" disabled={!carryingTreasure} onclick={drop}>Drop treasure</button>
+          {#each objectsHere as obj (obj.instanceId)}
+            <button class="stamp" disabled={view.turn.actionsEnded}
+              onclick={() => dispatch({ type: "pickUpObject", instanceId: obj.instanceId })}>
+              Pick up {cardDef(obj.cardId).name}</button>
+          {/each}
           <button class="stamp" onclick={startDiscardMode}>Discard cards…</button>
           <label class="inline draw-pick">
             draw