Add a bulk wipe & recalculate button to the dashboard

The per-account wipe works one account at a time; when every account is
carrying stale cached rows (the pre-roll dates again), that's a lot of
clicking. POST /api/accounts/wipe-all drops the cached rows for every
account on every firm and rebuilds them all from fresh reports — firms
in parallel, accounts within a firm at fetchDaysTraded's own pacing.
The toolbar button confirms inline with the same 28-day-window warning.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

app/page.tsx

@@ -244,6 +244,72 @@ function CredentialForm({ firm, onSaved }: { firm: FirmConfig; onSaved: () => vo
     );
 }
 
+/** Bulk form of the detail page's wipe: drops every account's cached rows on
+ *  every firm and refetches them all. One report per account, so the busy state
+ *  can run for minutes on a big roster. Same 28-day-window caveat, so the
+ *  confirm step spells it out. */
+function WipeAllButton() {
+    const [confirming, setConfirming] = useState(false);
+    const [busy, setBusy] = useState(false);
+    const [result, setResult] = useState('');
+
+    async function wipeAll() {
+        setBusy(true);
+        setResult('');
+        try {
+            const res = await fetch('/api/accounts/wipe-all', { method: 'POST' });
+            const body = await res.json().catch(() => ({}));
+            if (!res.ok) throw new Error(body.error ?? 'Wipe failed');
+            setResult(body.failedAccounts > 0
+                ? `Rebuilt ${body.wiped}, ${body.failedAccounts} refetch failure(s)`
+                : `Rebuilt ${body.wiped} account(s)`);
+            // No refresh hook needed — the dashboard polls /api/state every 5s.
+            setConfirming(false);
+        } catch (err) {
+            setResult(err instanceof Error ? err.message : 'Wipe failed');
+        } finally {
+            setBusy(false);
+        }
+    }
+
+    if (confirming) {
+        return (
+            <div className="flex items-center gap-2">
+                <span className="text-xs text-slate-500 max-w-64 text-right">
+                    Wipe every account&apos;s cached data and refetch? Days older than the 28-day report window are lost for good.
+                </span>
+                <button
+                    onClick={wipeAll}
+                    disabled={busy}
+                    className="px-4 py-2 bg-red-100 hover:bg-red-200 disabled:opacity-50 text-red-700 text-sm font-semibold rounded-lg transition-colors whitespace-nowrap"
+                >
+                    {busy ? 'Refetching…' : 'Wipe all'}
+                </button>
+                <button
+                    onClick={() => setConfirming(false)}
+                    disabled={busy}
+                    className="px-4 py-2 bg-white hover:bg-slate-100 disabled:opacity-50 text-slate-600 text-sm font-semibold rounded-lg border border-slate-200 transition-colors"
+                >
+                    Cancel
+                </button>
+            </div>
+        );
+    }
+
+    return (
+        <div className="flex items-center gap-2">
+            {result && <span className="text-xs text-slate-400">{result}</span>}
+            <button
+                onClick={() => setConfirming(true)}
+                className="px-4 py-2 bg-white text-slate-600 border border-slate-200 hover:text-red-600 hover:bg-red-50 hover:border-red-200 text-sm font-semibold rounded-lg transition-colors whitespace-nowrap"
+                title="Delete every account's cached daily P&L, fund transactions and meta, then rebuild them from fresh Tradovate reports"
+            >
+                Wipe & recalc all
+            </button>
+        </div>
+    );
+}
+
 function AccountRow({ account, firm, hideDead, privacy, onAssigned }: {
     account: AccountState;
     firm: FirmConfig;
@@ -623,6 +689,7 @@ export default function Home() {
                 <div className="flex items-center justify-between mb-6">
                     <h1 className="text-2xl font-bold text-slate-900">AutoTrader</h1>
                     <div className="flex items-center gap-2">
+                                <WipeAllButton />
                                 {deadCount > 0 && (
                                     <button
                                         onClick={() => setHideDead((h) => !h)}