Fix: Ensure only loading wrapper is interactable preview container (#583

)

- The preview CSS selector only prevented the div directly adjacent to
  the .bp-loading-wrapper from being interactable.
- This selector prevents all divs within the Preview Container EXCEPT
  .bp-loading-wrapper from being interactable. This prevents
interactions from the Preview content, find bar, controls, etc.

src/lib/_loading.scss

@@ -38,9 +38,13 @@
     }
 }
 
-// Preview content should not be interactable during loading
-:not(.bp-loaded) > .bp-loading-wrapper + div {
+// Only the loading wrapper should be interactable inside the Preview container
+.bp:not(.bp-loaded) {
     pointer-events: none;
+
+    & .bp-loading-wrapper {
+        pointer-events: all;
+    }
 }
 
 .bp-loading {