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.

pubspec.yaml

@@ -91,6 +91,7 @@ flutter:
     - assets/images/kccb_logo.svg
     - assets/images/avatar.jpg
     - assets/images/logo.png
+    - assets/images/sbi_logo.png
     - assets/images/kmobile_splash.jpg
     - assets/images/kmobile_splash2.png
     - assets/images/icon.svg
@@ -127,4 +128,4 @@ flutter:
 flutter_icons:
   android: true
   ios: false
-  image_path: assets/images/icon.png
+  image_path: assets/images/icon.png