Uncharged wands say what they need

"Opportunity Fire isn't letting me use a wand" — the window and the
wand both worked (verified headless); what refused him was the wand's
own first-use rule, which players from wandless editions have never
met: charges are set by a NUMBER card on first use. Selecting an
uncharged wand now says exactly that in the hint strip, before the
engine has to say no.

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

packages/web/src/App.svelte

@@ -112,6 +112,7 @@
   );
 
   const selectedDef = $derived(selectedCard ? cardDef(selectedCard.cardId) : null);
+  const WAND_IDS = new Set(["blaster-wand", "sticky-wand", "shift-wand", "warp-wand"]);
   const EDGE_CARDS = new Set([
     "create-wall", "destroy-wall", "illusion-wall", "wall-of-fire", "waterwall",
     "pick-lock", "jam-lock", "remove-lock", "master-key", "dispel-creation",
@@ -1235,7 +1236,9 @@
           {#if selectedDef}
             <strong class="hint-name">{selectedDef.name}</strong>
             {#if edgeSelectMode}<span>— click a wall line</span>{/if}
-            {#if selectedDef.cardType === "attack" && !cellSelectMode && !EDGE_CARDS.has(selectedCard?.cardId ?? "")}
+            {#if selectedCard && WAND_IDS.has(selectedCard.cardId) && view.wandCharges[selectedCard.instanceId] == null && !attachedNumber}
+              <span>— first use: tap a NUMBER card to set the wand's charges, then click a target</span>
+            {:else if selectedDef.cardType === "attack" && !cellSelectMode && !EDGE_CARDS.has(selectedCard?.cardId ?? "")}
               <span>— click a target, or a wall line to batter it{attachedNumber ? ` (powered by a ${numberTotal})` : ""}</span>
             {/if}
             {#if attachedMods.length > 0}