feat: Implement major features and fix theming bug

This commit introduces several new features and a critical bug fix.

- Implemented a full "Quick Pay" flow for both within and outside the bank, including IFSC validation, beneficiary verification, and a TPIN-based payment process.
- Added a date range filter to the Account Statement screen and streamlined the UI by removing the amount filters.
- Fixed a major bug that prevented dynamic theme changes from being applied. The app now correctly switches between color themes.
- Refactored and improved beneficiary management, transaction models, and the fund transfer flow to support NEFT/RTGS.

lib/features/fund_transfer/screens/payment_animation.dart

@@ -375,6 +375,14 @@ class _PaymentAnimationScreenState extends State<PaymentAnimationScreen> {
                                       "Date: ${response.date!.toLocal().toIso8601String()}",
                                       style: const TextStyle(fontSize: 16),
                                     ),
+                                  if (response.utr != null && response.utr!.isNotEmpty)
+                                    Padding(
+                                      padding: const EdgeInsets.only(top: 8.0),
+                                      child: Text(
+                                        'UTR: ${response.utr}',
+                                        style: const TextStyle(fontSize: 16),
+                                      ),
+                                    ),
                                 ],
                               )
                             : Column(