Pay Anything Flow Enhancements (#2564)

* fix: update Bitcoin and Litecoin Bech32 address patterns for improved detection for pay anything flow

* feat: add Litecoin MWEB address detection patterns for pay anything flow

* feat: Add support for ERC-681 payment scheme to QR and link to exchange send from external QR

* feat: Introduce TokenUtilities to centralize token management across viewmodels

- Added TokenUtilities class to centralize token-related operations for EVM, Solana, and Tron tokens.
- Refactored existing methods in ExchangeTradeViewModel and SendViewModel to utilize TokenUtilities.
- Updated PaymentRequest to include contractAddress.
- Enhanced payment QR scanning to fetch token details for QRs with contract addresses - ERC-681 QR scheme

* fix: Prefill amount with other data when app is brought up via payment deeplink on QR scan

* fix: Reduce trade not created errors WIP

* feat: Add exchange provider logging functionality

* feat: Enhance ERC681URI with amount normalization, prevents parsing issues with various input formats for amounts

* - Use regex from address validator for btc/ltc manual checks
- Add check for solana addresses
- Handle failures in normalizeToInteger method
- fix issue with address only being added when there's an amount

* feat: Trigger pay anything flow when address is pasted via ctrl v or paste input

* fix: remove duplicate registration

* fix: disable text selection in SendCard address field

* feat: Prevent swap option from showing for Mweb and Silent Payment addresses in Pay Anything flow

* refactor: remove notes widget and controllers from swap confirmation bottomsheet

* fix: Issue with tap send all button not responsive, and updateing fiat amount, after wallet syncing is complete if it was previously tapped while wallet was syncing

* fix: Resolve excessive decimal places error with input sanitization and formatting for amount entry

* fix: Add check for already usable amount format to prevent errors with Nano QR scanning

* fix: Improve fiat input handling by preventing unnecessary updates during user input

* fix: Handle potential null case for setReceiveAmountFromFiat

* Update lib/src/widgets/bottom_sheet/payment_confirmation_bottom_sheet.dart

---------

Co-authored-by: Omar Hatem <omarh.ismail1@gmail.com>

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

@@ -107,6 +107,8 @@ class SendCardState extends State<SendCard> with AutomaticKeepAliveClientMixin<S
 
   bool _effectsInstalled = false;
   BuildContext? loadingBottomSheetContext;
+  bool _justHandledPasteButton = false;
+  String _lastHandledAddress = '';
 
   @override
   void initState() {
@@ -385,22 +387,27 @@ class SendCardState extends State<SendCard> with AutomaticKeepAliveClientMixin<S
                         color: Theme.of(context).colorScheme.onSurfaceVariant,
                       ),
                   onPushPasteButton: (context) async {
-                    output.resetParsedAddress();
-                    await output.fetchParsedAddress(context);
+                    _justHandledPasteButton = true;
+                    try {
+                      output.resetParsedAddress();
+                      await output.fetchParsedAddress(context);
 
-                    final address =
-                        output.isParsedAddress ? output.extractedAddress : output.address;
+                      final address =
+                          output.isParsedAddress ? output.extractedAddress : output.address;
 
-                    await _handlePaymentFlow(
-                      address,
-                      PaymentRequest(
+                      await _handlePaymentFlow(
                         address,
-                        cryptoAmountController.text,
-                        noteController.text,
-                        "",
-                        null,
-                      ),
-                    );
+                        PaymentRequest(
+                          address,
+                          cryptoAmountController.text,
+                          noteController.text,
+                          "",
+                          null,
+                        ),
+                      );
+                    } finally {
+                      _justHandledPasteButton = false;
+                    }
                   },
                   onPushAddressBookButton: (context) async {
                     output.resetParsedAddress();
@@ -419,6 +426,7 @@ class SendCardState extends State<SendCard> with AutomaticKeepAliveClientMixin<S
                     fillColor: Theme.of(context).colorScheme.surfaceContainerHighest,
                     controller: extractedAddressController,
                     readOnly: true,
+                    enableInteractiveSelection: false,
                     textStyle: Theme.of(context).textTheme.bodyMedium?.copyWith(
                           fontSize: 16,
                           fontWeight: FontWeight.w500,
@@ -768,7 +776,42 @@ class SendCardState extends State<SendCard> with AutomaticKeepAliveClientMixin<S
 
     addressFocusNode.addListener(() async {
       if (!addressFocusNode.hasFocus && addressController.text.isNotEmpty) {
+        final current = addressController.text.trim();
+        if (current.isEmpty) return;
+        if (_justHandledPasteButton || _lastHandledAddress == current) return;
+
         await output.fetchParsedAddress(context);
+
+        // If it's a URI with params, go through URI flow
+        if (current.contains('=')) {
+          try {
+            final uri = Uri.parse(current);
+            _lastHandledAddress = current;
+            await _handlePaymentFlow(
+              uri.toString(),
+              PaymentRequest.fromUri(uri),
+            );
+            return;
+          } catch (_) {
+            // fall through to plain address
+          }
+        }
+
+        final parsedAddress = output.isParsedAddress
+            ? output.extractedAddress
+            : output.address;
+
+        _lastHandledAddress = current;
+        await _handlePaymentFlow(
+          parsedAddress,
+          PaymentRequest(
+            parsedAddress,
+            cryptoAmountController.text,
+            noteController.text,
+            "",
+            null,
+          ),
+        );
       }
     });
 

lib/src/screens/settings/other_settings_page.dart

@@ -138,6 +138,12 @@ class OtherSettingsPage extends BasePage {
                   title: '[dev] *QR tools',
                   handler: (context) => Navigator.of(context).pushNamed(Routes.devQRTools),
                 ),
+              if (FeatureFlag.hasDevOptions)
+                SettingsCellWithArrow(
+                  title: '[dev] exchange provider logs',
+                  handler: (BuildContext context) =>
+                      Navigator.of(context).pushNamed(Routes.devExchangeProviderLogs),
+                ),
               Spacer(),
               SettingsVersionCell(
                 title: S.of(context).version(_otherSettingsViewModel.currentVersion),