feat: close / close-all buttons in the terminal 'Current positions · live' panel

The one-click close only existed on the legacy dashboard's positions
table; the terminal dashboard the user actually sees had a read-only
positions panel. Adds a per-row 'close' button (confirm -> market close
via the existing /close-position API) and a 'close all' button in the
panel header (single confirm, sequential closes to avoid nonce races,
partial-failure report). Hidden in demo mode and when no trader is
selected; SWR keys refresh positions and account after closing.

web/src/components/terminal/TerminalDashboard.tsx

@@ -1,8 +1,9 @@
 import { useEffect, useMemo, useState } from 'react'
 import { createPortal } from 'react-dom'
 import type { CSSProperties } from 'react'
-import useSWR from 'swr'
+import useSWR, { mutate } from 'swr'
 import { api } from '../../lib/api'
+import { confirmToast, notify } from '../../lib/notify'
 import type {
   SystemStatus,
   AccountInfo,
@@ -116,6 +117,57 @@ export function TerminalDashboard({
   const traderId = selectedTrader?.trader_id || selectedTraderId
   useTick(1000)
   const clock = new Date().toLocaleTimeString('en-GB', { hour12: false })
+  const [closing, setClosing] = useState<string | null>(null)
+
+  async function closePositionRow(symbol: string, side: 'LONG' | 'SHORT') {
+    if (!traderId || closing) return
+    const ok = await confirmToast(`Market-close ${symbol} ${side}?`, {
+      title: 'Close position',
+      okText: 'Close',
+      cancelText: 'Cancel',
+    })
+    if (!ok) return
+    setClosing(symbol)
+    try {
+      await api.closePosition(traderId, symbol, side)
+      notify.success(`${symbol} ${side} closed`)
+      await Promise.all([
+        mutate(`positions-${traderId}`),
+        mutate(`account-${traderId}`),
+      ])
+    } catch (err) {
+      notify.error(err instanceof Error ? err.message : 'Close failed')
+    } finally {
+      setClosing(null)
+    }
+  }
+
+  async function closeAllPositions(open: Position[]) {
+    if (!traderId || closing || open.length === 0) return
+    const ok = await confirmToast(
+      `Market-close ALL ${open.length} open positions?`,
+      { title: 'Flatten book', okText: 'Close all', cancelText: 'Cancel' }
+    )
+    if (!ok) return
+    setClosing('__all__')
+    let failed = 0
+    // Sequential: parallel closes race on exchange nonces / rate limits.
+    for (const p of open) {
+      const side = /long|buy/i.test(p.side) ? 'LONG' : 'SHORT'
+      try {
+        await api.closePosition(traderId, p.symbol, side)
+      } catch {
+        failed++
+      }
+    }
+    await Promise.all([
+      mutate(`positions-${traderId}`),
+      mutate(`account-${traderId}`),
+    ])
+    if (failed === 0) notify.success('All positions closed')
+    else notify.error(`${failed}/${open.length} closes failed`)
+    setClosing(null)
+  }
 
   const { data: realFullStats } = useSWR(
     traderId ? ['full-stats', traderId] : null,
@@ -512,6 +564,26 @@ export function TerminalDashboard({
               <span className="tm-px" style={{ fontSize: 11 }}>Positions</span>
               <span className="tm-sc">Current positions · live</span>
               <span className="tm-sc" style={{ marginLeft: 'auto' }}>{positions?.length ?? 0} open</span>
+              {traderId && !on && positions && positions.length > 0 && (
+                <button
+                  type="button"
+                  onClick={() => void closeAllPositions(positions)}
+                  disabled={closing !== null}
+                  className="tm-mono"
+                  style={{
+                    background: 'transparent',
+                    border: '1px solid var(--tm-dn)',
+                    color: 'var(--tm-dn)',
+                    borderRadius: 3,
+                    fontSize: 9,
+                    padding: '1px 6px',
+                    cursor: closing ? 'not-allowed' : 'pointer',
+                    opacity: closing ? 0.5 : 1,
+                  }}
+                >
+                  {closing === '__all__' ? 'closing…' : 'close all'}
+                </button>
+              )}
             </div>
             {positions && positions.length > 0 ? (
               <table className="tm-mono" style={{ width: '100%', borderCollapse: 'collapse', fontSize: 11 }}>
@@ -523,6 +595,7 @@ export function TerminalDashboard({
                     <td style={{ padding: '0 0 3px', textAlign: 'right' }}>size</td>
                     <td style={{ padding: '0 0 3px', textAlign: 'right' }}>PnL</td>
                     <td style={{ padding: '0 0 3px', textAlign: 'right' }}>return%</td>
+                    {traderId && !on && <td style={{ padding: '0 0 3px' }} />}
                   </tr>
                 </thead>
                 <tbody>
@@ -538,6 +611,29 @@ export function TerminalDashboard({
                         <td style={{ padding: '5px 0', textAlign: 'right', color: 'var(--tm-ink-2)' }}>{fmtUsd(notional)}</td>
                         <td style={{ padding: '5px 0', textAlign: 'right' }} className={win ? 'tm-up' : 'tm-dn'}>{fmtUsd(p.unrealized_pnl, true)}</td>
                         <td style={{ padding: '5px 0', textAlign: 'right' }} className={win ? 'tm-up' : 'tm-dn'}>{(p.unrealized_pnl_pct ?? 0).toFixed(2)}%</td>
+                        {traderId && !on && (
+                          <td style={{ padding: '5px 0 5px 8px', textAlign: 'right', width: 1 }}>
+                            <button
+                              type="button"
+                              onClick={() => void closePositionRow(p.symbol, long ? 'LONG' : 'SHORT')}
+                              disabled={closing !== null}
+                              title={`Close ${p.symbol}`}
+                              className="tm-mono"
+                              style={{
+                                background: 'transparent',
+                                border: '1px solid var(--tm-dn)',
+                                color: 'var(--tm-dn)',
+                                borderRadius: 3,
+                                fontSize: 9,
+                                padding: '1px 5px',
+                                cursor: closing ? 'not-allowed' : 'pointer',
+                                opacity: closing ? 0.5 : 1,
+                              }}
+                            >
+                              {closing === p.symbol ? '…' : 'close'}
+                            </button>
+                          </td>
+                        )}
                       </tr>
                     )
                   })}