Auto-claim without the scheduler, and no claim twice

A payout locks in profit and opens nothing, so stopping the trading no
longer stops it: a claim watcher runs the same claims once a minute while
the scheduler is off (its tick still claims while it runs), and the
dashboard's Auto-claim payouts box turns them off.

From two independent reviews of the claim path:
- A claim holds every further claim on the account until Vest's
  transactions show its WITHDRAW. A sync already out when the claim lands
  (by sync generation, not the clock) no longer writes the pre-claim
  balance back, and a fresh sync follows the claim.
- A withdraw that fails in transit (timeout, reset, 5xx) may have gone in:
  it is recorded as of unknown outcome and holds claims the same way,
  until the transactions show it, or an hour of them shows it didn't.
- claimProfit checks Vest's own account: funded (or instant), and no more
  than the balance above its starting capital.
- A claiming account is marked in flight; runClaims sends the amount it
  re-checked under the mutex.
- The watcher starts before the rest of the init can fail; settings are
  validated before any is written.

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

app/page.tsx

@@ -743,6 +743,7 @@ export default function Home() {
     const [tickInterval, setTickInterval] = useState('60');
     const [tradeLoading, setTradeLoading] = useState(false);
     const [stopAfterAll, setStopAfterAll] = useState(false);
+    const [autoClaim, setAutoClaim] = useState(true);
 
     const handleSort = (col: SortKey) => {
         if (sortKey === col) {
@@ -812,8 +813,9 @@ export default function Home() {
 
         fetch('/api/settings')
             .then((r) => r.json())
-            .then((s: { tick_interval_seconds?: string | null }) => {
+            .then((s: { tick_interval_seconds?: string | null; auto_claim?: string | null }) => {
                 if (s.tick_interval_seconds != null) setTickInterval(s.tick_interval_seconds);
+                setAutoClaim(s.auto_claim !== 'off');
             })
             .catch(() => {});
 
@@ -1000,6 +1002,28 @@ export default function Home() {
                                 />
                                 <span className="text-xs text-slate-400 whitespace-nowrap">Stop after all eligible</span>
                             </label>
+                            {config.some((f) => f.platform === 'vest') && (
+                                <label
+                                    className="flex items-center gap-1.5 ml-2 cursor-pointer select-none"
+                                    title="Claim a funded account's profit as soon as it reaches its stage's target (Vest) — whether or not the scheduler is running"
+                                >
+                                    <input
+                                        type="checkbox"
+                                        checked={autoClaim}
+                                        onChange={(e) => {
+                                            const on = e.target.checked;
+                                            setAutoClaim(on);
+                                            fetch('/api/settings', {
+                                                method: 'PATCH',
+                                                headers: { 'Content-Type': 'application/json' },
+                                                body: JSON.stringify({ auto_claim: on ? 'on' : 'off' }),
+                                            }).then((r) => { if (!r.ok) setAutoClaim(!on); }).catch(() => setAutoClaim(!on));
+                                        }}
+                                        className="rounded border-slate-300 text-emerald-500 focus:ring-emerald-500"
+                                    />
+                                    <span className="text-xs text-slate-400 whitespace-nowrap">Auto-claim payouts</span>
+                                </label>
+                            )}
                             <div className="ml-auto flex items-center gap-2">
                                 {hasAnyPosition && (
                                     <button