fix view leak and add view count

src/render/mod.rs

@@ -264,6 +264,10 @@ impl UiRenderer {
             label: Some("ui rsc"),
         })
     }
+
+    pub fn view_count(&self) -> usize {
+        self.textures.view_count()
+    }
 }
 
 pub struct UiLimits {