CW-1069-implement-deuro-dapp-support (#2304)

* feat: started dEuro Savings integration

* fix: merge conflict regarding theming

* feat: Add dEuro Savings Screen

* feat: Change DEuro Savings UI

* feat: Complete DEuro Savings integration with UI enhancements and transaction support

* style: remove forgotten print statements

* feat: localize dEuro subtitle

* feat: add approval flow and priority handling to DEuro Savings integration

- Introduced approval flow for DEuro Savings to enable token approvals.
- Added priority handling for deposit and withdrawal operations.
- Updated UI to support approval state and interactions.
- Localized new strings for multiple languages.
- Enhanced transaction handling with separate approval and commit actions.

* feat: add support for ERC20 token approval transactions

- Introduced `signApprovalTransaction` and `createApprovalTransaction` methods.
- Added handling for infinite approvals.
- Implemented encoding for approval transaction data.
- Enhanced transaction creation flow with approval-specific functionality.

* Update UI

* feat: enhance DEuro Savings logic and UI with computed property and fix gradient background

* feat: localize transaction confirmation content for DEuro Savings

* feat: enable interest collection for DEuro Savings with localized support

* fix reformatting [skip ci]

---------

Co-authored-by: tuxsudo <tuxsudo@tux.pizza>
Co-authored-by: OmarHatem <omarh.ismail1@gmail.com>

lib/routes.dart

@@ -127,4 +127,6 @@ class Routes {
   static const walletGroupExistingSeedDescriptionPage = '/wallet_group_existing_seed_description_page';
   static const walletSeedVerificationPage = '/wallet_seed_verification_page';
   static const exchangeTradeExternalSendPage = '/exchange_trade_external_send_page';
+
+  static const dEuroSavings = '/integration/dEuro/savings';
 }