feat(accounts): add Modify Application for rejected Current/Savings/FD/RD accounts

- Add 'Modify Application' button in kebab menu for rejected accounts (all 4 types)
- Rewrite edit components with tab-based UI matching create form
- Pre-populate all create-time values in edit form: product, account status,
  customer segment, account type, joint holders, nominees, introducer,
  deposit account link, senior citizen rate, tenure, flags (msme/balanceSwap/autoDebit)
- Fix edit mode detection using accountNo presence
- Add preselectedIntroducer @Input to IntroducerSearchComponent for pre-fill
- Support both camelCase and lowercase keys for joint holders (MySQL queryForList)
- Fix account number display: actual accountNo before previewAccountNo
- Fix cbsAccountType restore: cbsAccountType only, avoid Fineract enum object
- Add nominees fetch via /clients/{id}/nominees API in all 4 edit components
- Fix RD/FD Interest Rate Chart: SimpleChanges to prevent reset race condition
- Pre-check Senior Citizen checkbox in edit form from isSeniorCitizen DB field
- Auto-calculate rate when tenure pre-filled in edit mode
- FD calculator: use backend calculate-fd-interest API for all compounding types
- Support interestCompoundingPeriodInMonths=0 (daily) in FD calculator API

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

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

@@ -114,6 +114,34 @@ export class FixedDepositsService {
     return this.http.get(`/fixeddepositaccounts/${accountId}`, { params: httpParams });
   }
 
+  /**
+   * Calculate FD maturity using backend formula.
+   * When submittedOnDate + daysInYear are provided, uses exact calendar-based calculation
+   * matching the actual account creation engine.
+   */
+  calculateFixedDepositInterest(params: {
+    principalAmount: number;
+    annualInterestRate: number;
+    tenureInMonths: number;
+    interestCompoundingPeriodInMonths: number;
+    interestPostingPeriodInMonths: number;
+    submittedOnDate?: string; // yyyy-MM-dd — enables exact calendar calculation
+    daysInYear?: number; // 360 or 365
+  }): Observable<any> {
+    let httpParams = new HttpParams();
+    Object.entries(params).forEach(
+      ([
+        key,
+        val
+      ]) => {
+        if (val !== undefined && val !== null) {
+          httpParams = httpParams.set(key, String(val));
+        }
+      }
+    );
+    return this.http.get(`/fixeddepositaccounts/calculate-fd-interest`, { params: httpParams });
+  }
+
   /**
    * @param fixedDepositAccount Fixed Deposit Account
    * @returns {Observable<any>}