Add dropper location selector: discover available droppers on network, pass through server, and add dropdown in order panel for location-based dispensing

web/client/src/components/InventoryGrid.jsx

@@ -15,6 +15,9 @@ function InventoryGrid() {
   const [orderAmount, setOrderAmount] = useState(1);
   const [sortBy, setSortBy] = useState('count');
   const [activeCategory, setActiveCategory] = useState('all');
+  const [selectedDropper, setSelectedDropper] = useState('');
+
+  const droppers = inventory.droppers || [];
 
   const items = getFilteredItems();
 
@@ -33,8 +36,8 @@ function InventoryGrid() {
 
   const handleOrder = useCallback(async () => {
     if (!selectedItem || orderAmount <= 0) return;
-    await orderItem(selectedItem.name, orderAmount);
-  }, [selectedItem, orderAmount, orderItem]);
+    await orderItem(selectedItem.name, orderAmount, selectedDropper || undefined);
+  }, [selectedItem, orderAmount, orderItem, selectedDropper]);
 
   const handleItemClick = (item) => {
     setSelectedItem(item);
@@ -162,6 +165,22 @@ function InventoryGrid() {
             <div className="order-section">
               <h4>📤 Order Items</h4>
               <div className="order-controls">
+                {droppers.length > 1 && (
+                  <div className="dropper-select-wrapper">
+                    <label className="dropper-label">📍 Dispense to:</label>
+                    <select
+                      className="dropper-select"
+                      value={selectedDropper}
+                      onChange={(e) => setSelectedDropper(e.target.value)}
+                    >
+                      {droppers.map((d) => (
+                        <option key={d.name} value={d.name}>
+                          {d.name.replace(/^minecraft:/, '')}{d.isDefault ? ' (default)' : ''}
+                        </option>
+                      ))}
+                    </select>
+                  </div>
+                )}
                 <div className="order-amount-controls">
                   <button className="mc-btn" onClick={() => setOrderAmount(Math.max(1, orderAmount - 1))}>-</button>
                   <input