feat(investment): interest in transaction log, accrued interest since last coupon, investment-only GL list

src/app/investment/investment-data.ts

@@ -135,6 +135,8 @@ export interface InvestmentHolding {
   settlementAmount?: number;
   /** Settlement date of the deal (deal date + T+n) — it can be settled on or after this day. */
   settlementDate?: string;
+  /** Last coupon date before the purchase; coupons fall every six months from it. */
+  lastIntDate?: string;
   /** Journal entry transaction posted when the deal was settled. */
   glTransactionId?: string;
 }