DXtrade: volatility measured once a day, next-leg hold on the dashboard, closed accounts dead

Each instrument's volatility is measured at the first good sync (or pick) of
a trade date and held for the day, so a day's sizing and hold estimate stay
put. The dashboard shows each DXtrade account's next-leg hold ("hold ~Nh")
with its symbol, notional, volatility and win odds. Accounts the firm has
closed (TERMINATED, EXPIRED, NO_TRADING) read as dead instead of inactive,
and skip the books check.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

app/page.tsx

@@ -390,6 +390,15 @@ function AccountRow({ account, firm, hideDead, privacy, onAssigned }: {
                             {typeof account.dllRoom === 'number' && (
                                 <span className="text-slate-500" title="Hard daily loss limit: what the firm's day may still lose before a breach. 10% of the limit is never spent."> · DLL room ${fmt(account.dllRoom)}</span>
                             )}
+                            {account.holdEstimate && (
+                                <span
+                                    className="text-slate-500"
+                                    title={`Next leg on ${account.holdEstimate.symbol}: $${Math.round(account.holdEstimate.notional).toLocaleString()} notional at today's measured volatility of ${(account.holdEstimate.volatilityPerDay * 100).toFixed(2)}%/day`
+                                        + (account.holdEstimate.winProbability !== null ? `, wins ~${Math.round(account.holdEstimate.winProbability * 100)}% of the time` : '')}
+                                >
+                                    {' · hold ~'}{account.holdEstimate.hours < 48 ? `${Math.round(account.holdEstimate.hours)}h` : `${(account.holdEstimate.hours / 24).toFixed(1)}d`}
+                                </span>
+                            )}
                         </span>
                     )}
                 </div>