Show fund transactions (W/D) on calendar, equity curve, and cash history table

- Persist fund transactions to SQLite (fund_transactions table) so they
  survive beyond Tradovate's 28-day report window
- Calendar: highlight W/D dates in amber with the amount shown below the day
- Equity curve: reduce running equity at withdrawal dates and show a vertical
  dashed amber line labelled W/D
- New Cash History table below calendar listing all trades and W/D events
  sorted newest-first

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

lib/db.ts

@@ -227,6 +227,30 @@ export function loadDailyPnL(accountId: number): { date: string; pnl: number }[]
     return (db.prepare('SELECT date, pnl FROM daily_pnl WHERE account_id = ? ORDER BY date').all(accountId) as { date: string; pnl: number }[]);
 }
 
+// ── Fund Transactions Cache ───────────────────────────────────────────────────
+
+db.exec(`
+    CREATE TABLE IF NOT EXISTS fund_transactions (
+        account_id   INTEGER NOT NULL,
+        account_name TEXT    NOT NULL,
+        date         TEXT    NOT NULL,
+        amount       REAL    NOT NULL,
+        PRIMARY KEY (account_id, date)
+    );
+`);
+
+export function saveFundTransactions(accountId: number, accountName: string, entries: { date: string; amount: number }[]): void {
+    const ins = db.prepare('INSERT OR REPLACE INTO fund_transactions (account_id, account_name, date, amount) VALUES (?, ?, ?, ?)');
+    const txn = db.transaction(() => {
+        for (const e of entries) ins.run(accountId, accountName, e.date, e.amount);
+    });
+    txn();
+}
+
+export function loadFundTransactions(accountId: number): { date: string; amount: number }[] {
+    return db.prepare('SELECT date, amount FROM fund_transactions WHERE account_id = ? ORDER BY date').all(accountId) as { date: string; amount: number }[];
+}
+
 // ── Account Meta ─────────────────────────────────────────────────────────────
 
 db.exec(`