Cw 973 in app gift card redemption flow plus UI (#2285)

* refactor: cleanup cake_pay folder

* refactor: add My Cards tab on the main screen

* ui: add user card item

* refactor: cakePay purchase flow

* feat: add user card info

* refactor: auth flow

* refactor: theme data

* revert

* Update qr_widget.dart

* fix: update with new themes

* minor fixes

* feat: put redemption flow under a feature flag

* feat: implement simulated purchasing flow in debug mode

* feat: support LTC and MWEB payments

* Update savings_page.dart

* fix: UI fixes

* add Cake Pay transaction sent bottom sheet

* localization

* Update cake_pay_buy_card_page.dart

* addressing review comments

* fix marge conflicts

lib/src/widgets/standard_slide_button_widget.dart

@@ -1,5 +1,6 @@
 import 'package:cake_wallet/src/widgets/primary_button.dart';
 import 'package:cake_wallet/themes/core/material_base_theme.dart';
+import 'package:cake_wallet/themes/utils/custom_theme_colors.dart';
 import 'package:flutter/material.dart';
 
 class StandardSlideButton extends StatefulWidget {
@@ -29,7 +30,9 @@ class _StandardSlideButtonState extends State<StandardSlideButton> {
   Widget build(BuildContext context) {
     final bool accessible = MediaQuery.of(context).accessibleNavigation;
 
-    final tileBackgroundColor = Theme.of(context).colorScheme.surfaceContainer;
+    final tileBackgroundColor = widget.currentTheme.isDark
+        ? CustomThemeColors.backgroundGradientColorDark
+        : CustomThemeColors.backgroundGradientColorLight;
 
     return accessible
         ? PrimaryButton(
@@ -87,7 +90,7 @@ class _StandardSlideButtonState extends State<StandardSlideButton> {
                           height: widget.height - 8,
                           decoration: BoxDecoration(
                             borderRadius: BorderRadius.circular(10),
-                            color: Theme.of(context).colorScheme.primary,
+                            color: Theme.of(context).colorScheme.surface,
                           ),
                           alignment: Alignment.center,
                           child: Icon(