fix: allow preview panel to reach phone aspect ratio on mobile

- Set code-wrap min-height to 120px so it can shrink further when
  the user drags the preview taller
- Increase resizable maxHeight from 70% to 80% to accommodate a
  phone-like aspect ratio in the preview panel

Author: Huxpro

src/example-preview/components/index.module.scss

@@ -169,7 +169,7 @@
     }
     .code-wrap {
       flex: 1;
-      min-height: 0;
+      min-height: 120px;
     }
     .preview-wrap .qrcode {
       margin-top: 0;
@@ -211,7 +211,7 @@
     }
     .code-wrap {
       flex: 1;
-      min-height: 0;
+      min-height: 120px;
     }
     .preview-wrap .qrcode {
       margin-top: 0;

src/example-preview/components/resizable.tsx

@@ -33,7 +33,7 @@ export const ResizableContainer = ({
           width: '100%',
         }}
         minHeight={100}
-        maxHeight="70%"
+        maxHeight="80%"
         handleStyle={{
           top: {
             top: '-8px',