fix(cashier): realistic branch-aware account numbers, dynamic date tags in summary report

Account No now always holds a genuine reference for its transaction type
(customer account, GL/facility code, IFSC, DD/PO/TDS/GST/cheque ref, or
UTR/RRN/UMRN for RTGS/NEFT/UPI/ATM/NACH) instead of a plain description.
Branch 2's view derives its own valid-format account numbers and IFSC
codes by shifting the numeric segment, rather than tagging a "BR2-" prefix
onto Branch 1's values, which looked fake for standardized formats.

Voucher/reference numbers' baked-in "2607" (Jul 2026) tag is now derived
from the real current date at render time, so it won't go stale next month.

feat(clients): auto-calculate Monthly/Annual Income and Turnover

Typing either the monthly or annual figure now fills in the other at a 12x
ratio (rounded to 2 decimals, no trailing ".00" on whole numbers). Guarded
against firing during prefillForEdit()'s initial load of an existing
client's independently-saved values, so editing doesn't silently overwrite
historical data that wasn't an exact 12x match.

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

src/app/clients/client-stepper/client-general-step/client-general-step.component.ts

@@ -533,6 +533,8 @@ export class ClientGeneralStepComponent implements OnInit, OnDestroy, OnChanges
   screeningLogId: number | null = null;
   /** Snapshot of the name that was last verified — used to invalidate verification when name changes */
   private verifiedName: string = '';
+  /** True while prefillForEdit() is patching historical monthly/annual values — see linkMonthlyAnnual(). */
+  private suppressMonthlyAnnualLink = false;
 
   /**
    * @param {FormBuilder} formBuilder Form Builder
@@ -709,6 +711,12 @@ export class ClientGeneralStepComponent implements OnInit, OnDestroy, OnChanges
     const data = this.clientData;
     this.loadExistingSeniorPwdDocuments();
 
+    // Loading an existing client's independently-saved monthly/annual values must not run
+    // through the auto-calc in linkMonthlyAnnual() — patching monthlyIncome then annualIncome
+    // (or vice versa) would otherwise have each overwrite the other via its valueChanges,
+    // instead of keeping the exact historical values as saved.
+    this.suppressMonthlyAnnualLink = true;
+
     // Patch all base controls that exist on the form
     this.createClientForm.patchValue({
       officeId: data.officeId,
@@ -743,6 +751,7 @@ export class ClientGeneralStepComponent implements OnInit, OnDestroy, OnChanges
         ? new Date(data.timeline.submittedOnDate)
         : this.settingsService.businessDate
     });
+    this.suppressMonthlyAnnualLink = false;
 
     // Patch name fields (already created by buildDependencies via legalFormId subscription)
     const legalFormId = data.legalForm?.id || LegalFormId.PERSON;
@@ -954,6 +963,43 @@ export class ClientGeneralStepComponent implements OnInit, OnDestroy, OnChanges
         Validators.required
       ]
     });
+
+    this.linkMonthlyAnnual('monthlyIncome', 'annualIncome');
+    this.linkMonthlyAnnual('monthlyTurnover', 'annualTurnover');
+  }
+
+  /**
+   * Keeps a Monthly/Annual pair of amount fields in sync at a 12x ratio — typing into either
+   * one auto-fills the other. Uses { emitEvent: false } on the write side so the two
+   * subscriptions don't trigger each other back and forth.
+   */
+  /** Rounds to at most 2 decimals without padding whole numbers with a trailing ".00". */
+  private round2(n: number): string {
+    return (Math.round(n * 100) / 100).toString();
+  }
+
+  private linkMonthlyAnnual(monthlyControlName: string, annualControlName: string): void {
+    const monthly = this.createClientForm.get(monthlyControlName);
+    const annual = this.createClientForm.get(annualControlName);
+    if (!monthly || !annual) {
+      return;
+    }
+
+    monthly.valueChanges.subscribe((value) => {
+      if (this.suppressMonthlyAnnualLink) {
+        return;
+      }
+      const num = parseFloat(value);
+      annual.setValue(!isNaN(num) && num >= 0 ? this.round2(num * 12) : '', { emitEvent: false });
+    });
+
+    annual.valueChanges.subscribe((value) => {
+      if (this.suppressMonthlyAnnualLink) {
+        return;
+      }
+      const num = parseFloat(value);
+      monthly.setValue(!isNaN(num) && num >= 0 ? this.round2(num / 12) : '', { emitEvent: false });
+    });
   }
 
   /**