fix: zcash address for exchange (#3491)

* fix: zcash address for exchange

* fix: honour the restore height the user entered

- Make Zcash rescan work in both directions by resetting sync from the new birth height
- Keep the entered height when restoring a wallet from keys
- Tolerate grouping separators in typed restore heights

---------

Co-authored-by: Vik Sharma <vik@cakewallet.com>

lib/src/screens/restore/wallet_restore_page.dart

@@ -215,6 +215,10 @@ class WalletRestorePage extends BasePage {
             walletRestoreFromKeysFormKey.currentState!.privateKeyController.text;
         credentials['name'] =
             walletRestoreFromKeysFormKey.currentState!.nameTextEditingController.text;
+        if (walletRestoreViewModel.hasBlockchainHeightSelector) {
+          credentials['height'] =
+              walletRestoreFromKeysFormKey.currentState!.blockchainHeightKey.currentState?.height;
+        }
       } else {
         credentials['name'] =
             walletRestoreFromKeysFormKey.currentState!.nameTextEditingController.text;

lib/src/widgets/blockchain_height_widget.dart

@@ -65,7 +65,8 @@ class BlockchainHeightState extends State<BlockchainHeightWidget> {
       try {
         final int _height;
         if (restoreHeightController.text.isNotEmpty) {
-          _height = int.tryParse(restoreHeightController.text) ?? 0;
+          final digits = restoreHeightController.text.replaceAll(RegExp(r'[^0-9]'), '');
+          _height = int.tryParse(digits) ?? 0;
         } else {
           _height = 0;
         }