Add Random direction option — picks Buy or Sell once per batch

All accounts in the same batch trade the same resolved direction.
Each new batch (after positions are flat) picks a fresh random direction.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/page.tsx

@@ -247,7 +247,7 @@ function FirmRows({ state, firm, deleteMode, selected, onToggle, hideDead, priva
 
 interface SchedulerStatus {
     running: boolean;
-    action: 'Buy' | 'Sell';
+    action: 'Buy' | 'Sell' | 'Random';
     symbol: string;
     lastRun: string | null;
 }
@@ -267,7 +267,7 @@ export default function Home() {
     const [scheduler, setScheduler] = useState<SchedulerStatus>({ running: false, action: 'Buy', symbol: 'NQ', lastRun: null });
     const [enabledSymbols, setEnabledSymbols] = useState<string[]>([]);
     const [tradeSymbol, setTradeSymbol] = useState('');
-    const [tradeAction, setTradeAction] = useState<'Buy' | 'Sell'>('Buy');
+    const [tradeAction, setTradeAction] = useState<'Buy' | 'Sell' | 'Random'>('Buy');
     const [tradeLoading, setTradeLoading] = useState(false);
 
     const handleSort = (col: SortKey) => {
@@ -487,6 +487,12 @@ export default function Home() {
                                     >
                                         Sell
                                     </button>
+                                    <button
+                                        onClick={() => setTradeAction('Random')}
+                                        className={`px-3 py-1.5 transition-colors border-l border-slate-200 ${tradeAction === 'Random' ? 'bg-purple-500 text-white' : 'text-slate-500 hover:bg-slate-50'}`}
+                                    >
+                                        Random
+                                    </button>
                                 </div>
                             </div>
                             <button