feat: close-all button on the dashboard positions panel

Per-position one-click close already existed (Action column, with
confirm), but flattening the whole book took one confirm per position.
Adds a 'Close All' button next to the position count: single confirm,
then closes every position sequentially (parallel closes can race on
exchange nonces/rate limits), refreshes via SWR and reports a partial-
failure count. zh/en/id translations included.

web/src/i18n/translations.ts

@@ -1015,6 +1015,11 @@ export const translations = {
       cancel: 'Cancel',
       positionClosed: 'Position closed successfully',
       closeFailed: 'Failed to close position',
+      closeAll: 'Close All',
+      confirmCloseAllPositions:
+        'Market-close ALL {count} open positions?',
+      allPositionsClosed: 'All positions closed',
+      closeAllPartial: '{failed} of {count} positions failed to close',
       hideAddress: 'Hide address',
       showFullAddress: 'Show full address',
       copyAddress: 'Copy address',
@@ -2181,6 +2186,10 @@ export const translations = {
       cancel: '取消',
       positionClosed: '平仓成功',
       closeFailed: '平仓失败',
+      closeAll: '一键全平',
+      confirmCloseAllPositions: '确定要市价平掉全部 {count} 个持仓吗？',
+      allPositionsClosed: '全部持仓已平',
+      closeAllPartial: '{count} 个持仓中有 {failed} 个平仓失败',
       hideAddress: '隐藏地址',
       showFullAddress: '显示完整地址',
       copyAddress: '复制地址',
@@ -3293,6 +3302,11 @@ export const translations = {
       cancel: 'Batal',
       positionClosed: 'Posisi berhasil ditutup',
       closeFailed: 'Gagal menutup posisi',
+      closeAll: 'Tutup Semua',
+      confirmCloseAllPositions:
+        'Tutup SEMUA {count} posisi terbuka dengan harga pasar?',
+      allPositionsClosed: 'Semua posisi ditutup',
+      closeAllPartial: '{failed} dari {count} posisi gagal ditutup',
       hideAddress: 'Sembunyikan alamat',
       showFullAddress: 'Tampilkan alamat lengkap',
       copyAddress: 'Salin alamat',

web/src/pages/TraderDashboardPage.tsx

@@ -137,6 +137,7 @@ export function TraderDashboardPage({
     exchanges,
 }: TraderDashboardPageProps) {
     const [closingPosition, setClosingPosition] = useState<string | null>(null)
+    const [closingAll, setClosingAll] = useState(false)
     const [selectedChartSymbol, setSelectedChartSymbol] = useState<string | undefined>(undefined)
     const [chartUpdateKey, setChartUpdateKey] = useState<number>(0)
     const chartSectionRef = useRef<HTMLDivElement>(null)
@@ -231,6 +232,52 @@ export function TraderDashboardPage({
         }
     }
 
+    const handleCloseAllPositions = async () => {
+        if (!selectedTraderId || !positions || positions.length === 0) return
+
+        const count = String(positions.length)
+        const confirmed = await confirmToast(
+            t('traderDashboard.confirmCloseAllPositions', language, { count }),
+            {
+                title: t('traderDashboard.confirmClose', language),
+                okText: t('traderDashboard.confirm', language),
+                cancelText: t('traderDashboard.cancel', language),
+            }
+        )
+        if (!confirmed) return
+
+        setClosingAll(true)
+        let failed = 0
+        // Sequential on purpose: parallel closes on the same account can race
+        // on exchange nonces (Hyperliquid) and rate limits.
+        for (const pos of positions) {
+            try {
+                await api.closePosition(
+                    selectedTraderId,
+                    pos.symbol,
+                    pos.side.toUpperCase()
+                )
+            } catch {
+                failed++
+            }
+        }
+        await Promise.all([
+            mutate(`positions-${selectedTraderId}`),
+            mutate(`account-${selectedTraderId}`),
+        ])
+        if (failed === 0) {
+            notify.success(t('traderDashboard.allPositionsClosed', language))
+        } else {
+            notify.error(
+                t('traderDashboard.closeAllPartial', language, {
+                    failed: String(failed),
+                    count,
+                })
+            )
+        }
+        setClosingAll(false)
+    }
+
     // If API failed with error, show empty state (likely backend not running)
     if (tradersError) {
         return (
@@ -588,8 +635,24 @@ export function TraderDashboardPage({
                                     <span className="text-blue-500">◈</span> {t('currentPositions', language)}
                                 </h2>
                                 {positions && positions.length > 0 && (
-                                    <div className="text-xs px-2 py-1 rounded bg-nofx-gold/10 text-nofx-gold border border-nofx-gold/20 font-mono">
-                                        {positions.length} {t('active', language)}
+                                    <div className="flex items-center gap-2">
+                                        <div className="text-xs px-2 py-1 rounded bg-nofx-gold/10 text-nofx-gold border border-nofx-gold/20 font-mono">
+                                            {positions.length} {t('active', language)}
+                                        </div>
+                                        <button
+                                            type="button"
+                                            onClick={() => void handleCloseAllPositions()}
+                                            disabled={closingAll || closingPosition !== null}
+                                            className="inline-flex items-center gap-1 px-2 py-1 rounded text-xs font-semibold transition-all disabled:opacity-50 disabled:cursor-not-allowed bg-nofx-danger/10 text-nofx-danger border border-nofx-danger/30 hover:bg-nofx-danger/20"
+                                            title={t('traderDashboard.closeAll', language)}
+                                        >
+                                            {closingAll ? (
+                                                <Loader2 className="w-3 h-3 animate-spin" />
+                                            ) : (
+                                                <LogOut className="w-3 h-3" />
+                                            )}
+                                            {t('traderDashboard.closeAll', language)}
+                                        </button>
                                     </div>
                                 )}
                             </div>