Encounter drag reorder via order field

Encounter cards draggable (ChevronsUpDown handle). Drop reorders, batch
updates order field on affected encounter docs. Sort by order (fallback
createdAt). New encounter gets order = max+1.

src/App.js

@@ -2012,6 +2012,7 @@ function EncounterManager({ campaignId, initialActiveEncounterId, campaignCharac
   const [showCreateModal, setShowCreateModal] = useState(false);
   const [showDeleteConfirm, setShowDeleteConfirm] = useState(false);
   const [itemToDelete, setItemToDelete] = useState(null);
+  const [draggedEncounterId, setDraggedEncounterId] = useState(null);
 
   const selectedEncounterIdRef = useRef(selectedEncounterId);
 
@@ -2019,6 +2020,45 @@ function EncounterManager({ campaignId, initialActiveEncounterId, campaignCharac
     if (encountersData) setEncounters(encountersData);
   }, [encountersData]);
 
+  // Sort by order field (fallback createdAt). Drag reorder writes order.
+  const sortedEncounters = [...(encounters || [])].sort((a, b) => {
+    const ao = a.order ?? null, bo = b.order ?? null;
+    if (ao !== null && bo !== null) return ao - bo;
+    if (ao !== null) return -1;
+    if (bo !== null) return 1;
+    return (a.createdAt || '').localeCompare(b.createdAt || '');
+  });
+
+  const handleEncounterDragStart = (e, id) => {
+    setDraggedEncounterId(id);
+    e.dataTransfer.effectAllowed = 'move';
+  };
+  const handleEncounterDragOver = (e) => {
+    e.preventDefault();
+    e.dataTransfer.dropEffect = 'move';
+  };
+  const handleEncounterDrop = async (e, targetId) => {
+    e.preventDefault();
+    if (!db || !draggedEncounterId || draggedEncounterId === targetId) {
+      setDraggedEncounterId(null);
+      return;
+    }
+    const reordered = [...sortedEncounters];
+    const fromIdx = reordered.findIndex(x => x.id === draggedEncounterId);
+    const toIdx = reordered.findIndex(x => x.id === targetId);
+    if (fromIdx === -1 || toIdx === -1) { setDraggedEncounterId(null); return; }
+    const [moved] = reordered.splice(fromIdx, 1);
+    reordered.splice(toIdx, 0, moved);
+    // assign order = index, batch update
+    const ops = reordered.map((enc, i) => ({
+      type: 'update',
+      path: `${getPath.encounters(campaignId)}/${enc.id}`,
+      data: { order: i },
+    }));
+    try { await storage.batchWrite(ops); } catch (err) {}
+    setDraggedEncounterId(null);
+  };
+
   useEffect(() => {
     selectedEncounterIdRef.current = selectedEncounterId;
   }, [selectedEncounterId]);
@@ -2063,6 +2103,7 @@ function EncounterManager({ campaignId, initialActiveEncounterId, campaignCharac
         isStarted: false,
         isPaused: false,
         ruleset: ruleset || '5e',
+        order: (encounters || []).reduce((max, e) => Math.max(max, e.order ?? -1), -1) + 1,
       });
 
       setShowCreateModal(false);
@@ -2169,7 +2210,7 @@ function EncounterManager({ campaignId, initialActiveEncounterId, campaignCharac
         )}
 
         <div className="space-y-3">
-          {encounters?.map(encounter => {
+          {sortedEncounters.map(encounter => {
             const isLive = activeDisplayInfo &&
               activeDisplayInfo.activeCampaignId === campaignId &&
               activeDisplayInfo.activeEncounterId === encounter.id;
@@ -2177,7 +2218,12 @@ function EncounterManager({ campaignId, initialActiveEncounterId, campaignCharac
             return (
               <div
                 key={encounter.id}
-                className={`p-3 rounded-md shadow transition-all ${selectedEncounterId === encounter.id ? 'bg-amber-900 ring-2 ring-amber-500' : 'bg-stone-800 hover:bg-stone-700'} ${isLive ? 'ring-2 ring-green-500 shadow-md shadow-green-500/30' : ''}`}
+                draggable
+                onDragStart={(e) => handleEncounterDragStart(e, encounter.id)}
+                onDragOver={handleEncounterDragOver}
+                onDrop={(e) => handleEncounterDrop(e, encounter.id)}
+                onDragEnd={() => setDraggedEncounterId(null)}
+                className={`p-3 rounded-md shadow transition-all ${selectedEncounterId === encounter.id ? 'bg-amber-900 ring-2 ring-amber-500' : 'bg-stone-800 hover:bg-stone-700'} ${isLive ? 'ring-2 ring-green-500 shadow-md shadow-green-500/30' : ''} ${draggedEncounterId === encounter.id ? 'opacity-50 ring-2 ring-yellow-400' : ''} cursor-grab`}
               >
                 <div className="flex justify-between items-center">
                   <div onClick={() => setSelectedEncounterId(encounter.id)} className="cursor-pointer flex-grow">
@@ -2192,6 +2238,11 @@ function EncounterManager({ campaignId, initialActiveEncounterId, campaignCharac
                     )}
                   </div>
                   <div className="flex items-center space-x-2">
+                    <ChevronsUpDown
+                      size={18}
+                      className="text-stone-400 flex-shrink-0 cursor-grab"
+                      title="Drag to reorder"
+                    />
                     <button
                       onClick={() => handleTogglePlayerDisplay(encounter.id)}
                       className={`p-1 rounded transition-colors ${isLive ? 'bg-red-500 hover:bg-red-600 text-white' : 'text-amber-400 hover:text-amber-300 bg-stone-700 hover:bg-stone-600'}`}