feat(fd): add FD Dashboard -- maturity ladder + manual Renew action

New screen (Deposits menu, repurposing the dead "FD Maturity Report" shell button): every
active Fixed Deposit positioned against its own maturity date (Matured / Due Soon / Upcoming /
On Track), computed client-side from maturityDate so it can never drift out of step with the
account. Reads the new lean maturity-dashboard backend endpoint.

A matured, renewable row (no maturity instruction chosen at account-opening, or an explicit
Reinvest instruction still waiting on its product's grace period) gets a Renew action wired to
the account's own Payment dialog -- see the FD account-view commit for that side of it.

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

src/app/deposits/fixed-deposits/fixed-deposits.service.ts

@@ -154,6 +154,26 @@ export class FixedDepositsService {
     return this.http.get(`/fixeddepositaccounts/calculate-fd-interest`, { params: httpParams });
   }
 
+  /**
+   * FD Dashboard's "Renew" action on a matured FD whose product has a renewal grace period
+   * configured: backdated to the original maturity date within the grace window, or from today
+   * with a gap-period interest credit (at the linked Savings account's rate) once it has passed.
+   * @param accountId Fixed Deposit Account Id
+   * @returns {Observable<any>} { renewedAccountId, maturityDate, maturityAmount, backdated, gapInterestAmount? }
+   */
+  /** `reinvestType` is the staff's choice made at renewal time: 300 = Reinvest Principal + Interest,
+   *  400 = Reinvest Principal Only (rest of the balance goes to the FD's linked Savings account). */
+  renewFixedDepositAccount(accountId: string | number, reinvestType: 300 | 400): Observable<any> {
+    return this.http.post(`/fixeddepositaccounts/${accountId}/renew`, { reinvestType });
+  }
+
+  /** Pre-step the Payment dialog calls, from the FD Dashboard, before submitting the generic `payment`
+   *  command -- credits gap-period interest (at the linked account's rate) if the product's renewal
+   *  grace window has passed; a no-op (`gapInterestAmount: 0`) if still within it. */
+  creditGapInterestIfPastGrace(accountId: string | number): Observable<any> {
+    return this.http.post(`/fixeddepositaccounts/${accountId}/credit-gap-interest`, {});
+  }
+
   /**
    * @param fixedDepositAccount Fixed Deposit Account
    * @returns {Observable<any>}