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/current-accounts/current-account-stepper/current-account-digital-step/current-account-digital-step.component.ts

@@ -40,10 +40,19 @@ const DEFAULT_FACILITY_CONFIG = {
 })
 export class CurrentAccountDigitalStepComponent {
   facilityConfig = { ...DEFAULT_FACILITY_CONFIG };
+  private hasExistingAccount = false;
+
+  @Input()
+  set existingAccount(value: any) {
+    if (value?.accountFacilityConfig) {
+      this.hasExistingAccount = true;
+      this.facilityConfig = { ...DEFAULT_FACILITY_CONFIG, ...value.accountFacilityConfig };
+    }
+  }
 
   @Input()
   set currentAccountProductTemplate(value: any) {
-    if (value?.accountFacilityConfig) {
+    if (!this.hasExistingAccount && value?.accountFacilityConfig) {
       this.facilityConfig = { ...DEFAULT_FACILITY_CONFIG, ...value.accountFacilityConfig };
     }
   }