feat Add gradient-only card design and icon style picker (#3054)

* feat Add gradient-only card design and icon style picker

* refactor: Migrate card icon style to index-based storage

* feat: Add new card icons/styles for icon panel

* feat: add generic cake card icon

* Update coin icons and add opacity

* Remove vector icon files

* Remove vector icon files

* add xmr-og.webp

* feat: add animated switcher to icon style panel

* Enhance icson style preview
fix special gradient bug on plain style card

* Fix card styles ignoring special gradient text color combination

* Improve icon mgmt for card design handling, other fixes also based on review too

* fix: Add bounds check to icon style index

* fix: monero classic icon not displaying

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Co-authored-by: tuxsudo <tuxsudo@tux.pizza>

lib/src/widgets/cake_image_widget.dart

@@ -71,6 +71,7 @@ class CakeImageWidget extends StatelessWidget {
           width: width,
           fit: fit,
           color: color,
+          errorBuilder: (_, __, ___) => _buildErrorWidget(context),
         );
       }
     } else {