Add setting to toggle scale grid visibility (#2838)

* Add a setting for showScaleGrid

* Fix up setting persistence, move under modeling

* Make the setting actually do something

* the lamest fmt I've seen in a while

* Fix clippy warnings

* Add snapshot tests for grid (first time using Playwright masks)

* A snapshot a day keeps the bugs away! 📷🐛 (OS: ubuntu)

* Re-run CI after new screenshots added

---------

Co-authored-by: Jess Frazelle <jessfraz@users.noreply.github.com>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

src/components/SettingsAuthProvider.tsx

@@ -134,6 +134,11 @@ export const SettingsAuthProviderBase = ({
             },
           })
         },
+        setEngineScaleGridVisibility: (context) => {
+          engineCommandManager.setScaleGridVisibility(
+            context.modeling.showScaleGrid.current
+          )
+        },
         setClientTheme: (context) => {
           const opposingTheme = getOppositeTheme(context.app.theme.current)
           sceneInfra.theme = opposingTheme