CW-1017: Monero minor enhancements (#2347)

* feat: add max decimal handling for crypto amounts and test coverage

* fix: correct decimal point handling in `withMaxDecimals` and update related test

* fix: ensure amount formatting aligns with selected currency decimals in ReceivePage

* fix: ensure amount controller syncs with ViewModel in AddressPage and ReceivePage

* feat: add support for currency decimals and streamline amount handling logic

* fix: ensure crypto and fiat amounts sync correctly in Send ViewModel

lib/src/screens/dashboard/pages/address_page.dart

@@ -8,7 +8,6 @@ import 'package:cw_core/receive_page_option.dart';
 import 'package:cake_wallet/src/screens/dashboard/widgets/present_receive_option_picker.dart';
 import 'package:cake_wallet/src/widgets/gradient_background.dart';
 import 'package:cake_wallet/src/widgets/keyboard_done_button.dart';
-import 'package:cake_wallet/themes/core/material_base_theme.dart';
 import 'package:cake_wallet/utils/responsive_layout_util.dart';
 import 'package:cake_wallet/utils/share_util.dart';
 import 'package:cake_wallet/view_model/dashboard/receive_option_view_model.dart';
@@ -34,9 +33,7 @@ class AddressPage extends BasePage {
         _amountController = TextEditingController() {
     _amountController.addListener(() {
       if (_formKey.currentState!.validate()) {
-        addressListViewModel.changeAmount(
-          _amountController.text,
-        );
+        addressListViewModel.changeAmount(_amountController.text);
       }
     });
   }
@@ -79,7 +76,7 @@ class AddressPage extends BasePage {
             label: !isMobileView ? S.of(context).close : S.of(context).seed_alert_back,
             child: TextButton(
               style: ButtonStyle(
-                overlayColor: MaterialStateColor.resolveWith((states) => Colors.transparent),
+                overlayColor: WidgetStateColor.resolveWith((states) => Colors.transparent),
               ),
               onPressed: () => onClose(context),
               child: !isMobileView ? _closeButton : _backButton,

lib/src/screens/exchange/widgets/exchange_card.dart

@@ -225,6 +225,7 @@ class ExchangeCardState<T extends Currency> extends State<ExchangeCard<T>> {
                 ValueKey('${_cardInstanceName}_currency_amount_textfield_widget_key'),
             imageArrow: widget.imageArrow,
             selectedCurrency: _selectedCurrency.toString(),
+            selectedCurrencyDecimals: _selectedCurrency.decimals,
             amountFocusNode: widget.amountFocusNode,
             amountController: amountController,
             onTapPicker: () => _presentPicker(context),

lib/src/screens/receive/widgets/currency_input_field.dart

@@ -1,12 +1,14 @@
 import 'package:cake_wallet/generated/i18n.dart';
 import 'package:cake_wallet/src/widgets/base_text_form_field.dart';
 import 'package:cake_wallet/themes/core/material_base_theme.dart';
+import 'package:cw_core/crypto_amount_format.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 
 class CurrencyAmountTextField extends StatelessWidget {
   const CurrencyAmountTextField({
     required this.selectedCurrency,
+    required this.selectedCurrencyDecimals,
     required this.amountFocusNode,
     required this.amountController,
     required this.isAmountEditable,
@@ -42,6 +44,7 @@ class CurrencyAmountTextField extends StatelessWidget {
   final Key? currencyAmountTextFieldWidgetKey;
   final Widget? imageArrow;
   final String selectedCurrency;
+  final int selectedCurrencyDecimals;
   final String? tag;
   final String? hintText;
   final Color? tagBackgroundColor;
@@ -197,6 +200,8 @@ class CurrencyAmountTextField extends StatelessWidget {
                             color: Theme.of(context).colorScheme.onSurfaceVariant,
                           ),
                       validator: isAmountEditable ? currencyValueValidator : null,
+                      onChanged: (value) => amountController.text =
+                          value.replaceAll(',', '.').withMaxDecimals(selectedCurrencyDecimals),
                     ),
                   ),
                 ),

lib/src/screens/receive/widgets/qr_widget.dart

@@ -211,6 +211,8 @@ class QRWidget extends StatelessWidget {
                                 hasUnderlineBorder: true,
                                 borderWidth: 0.0,
                                 selectedCurrency: _currencyName,
+                                selectedCurrencyDecimals:
+                                    addressListViewModel.selectedCurrency.decimals,
                                 amountFocusNode: amountTextFieldFocusNode,
                                 amountController: amountController,
                                 padding: EdgeInsets.only(top: 20, left: _width / 4),

lib/src/screens/send/widgets/send_card.dart

@@ -247,6 +247,7 @@ class SendCardState extends State<SendCard> with AutomaticKeepAliveClientMixin<S
                 currencyAmountTextFieldWidgetKey:
                     ValueKey('send_page_crypto_currency_amount_textfield_widget_key'),
                 selectedCurrency: sendViewModel.selectedCryptoCurrency.title,
+                selectedCurrencyDecimals: sendViewModel.selectedCryptoCurrency.decimals,
                 amountFocusNode: widget.cryptoAmountFocus,
                 amountController: cryptoAmountController,
                 isAmountEditable: true,
@@ -308,6 +309,7 @@ class SendCardState extends State<SendCard> with AutomaticKeepAliveClientMixin<S
                   currencyAmountTextFieldWidgetKey:
                       ValueKey('send_page_fiat_currency_amount_textfield_widget_key'),
                   selectedCurrency: sendViewModel.fiat.title,
+                  selectedCurrencyDecimals: sendViewModel.fiat.decimals,
                   amountFocusNode: widget.fiatAmountFocus,
                   amountController: fiatAmountController,
                   hintText: '0.00',

lib/src/screens/send/widgets/send_template_card.dart

@@ -122,6 +122,7 @@ class SendTemplateCard extends StatelessWidget {
                           hasUnderlineBorder: true,
                           borderWidth: 0.0,
                           selectedCurrency: template.selectedCurrency.title,
+                          selectedCurrencyDecimals: template.selectedCurrency.decimals,
                           amountFocusNode: _cryptoAmountFocus,
                           amountController: _cryptoAmountController,
                           isSelected: template.isCryptoSelected,
@@ -148,6 +149,7 @@ class SendTemplateCard extends StatelessWidget {
                           hasUnderlineBorder: true,
                           borderWidth: 0.0,
                           selectedCurrency: sendTemplateViewModel.fiatCurrency,
+                          selectedCurrencyDecimals: sendTemplateViewModel.fiatCurrencyDecimals,
                           amountFocusNode: _fiatAmountFocus,
                           amountController: _fiatAmountController,
                           isSelected: !template.isCryptoSelected,