Make the Reset View button do the same view_isometric behavior as load (#6934)

* Make the Reset View button do the same view_isometric behavior as load

Just copying some logic from the EngineStream code to make that button
behave the same way: old initial camera position while in Playwright,
isometric view for normal users.

* Move duplicate code into shared `resetCameraPosition` function

* Fix lints

src/lib/resetCameraPosition.ts

@@ -0,0 +1,40 @@
+import { DEFAULT_DEFAULT_LENGTH_UNIT } from '@src/lib/constants'
+import { isPlaywright } from '@src/lib/isPlaywright'
+import { engineCommandManager, kclManager } from '@src/lib/singletons'
+import {
+  engineStreamZoomToFit,
+  engineViewIsometricWithoutGeometryPresent,
+  engineViewIsometricWithGeometryPresent,
+} from '@src/lib/utils'
+
+/**
+ * Reset the camera position to a baseline, which is isometric for
+ * normal users and a deprecated "front-down" view for playwright tests.
+ *
+ * Gotcha: Playwright E2E tests will be zoom_to_fit, when you try to recreate the e2e test manually
+ * your localhost will do view_isometric. Turn this boolean on to have the same experience when manually
+ * debugging e2e tests
+ */
+export async function resetCameraPosition() {
+  // We need a padding of 0.1 for zoom_to_fit for all E2E tests since they were originally
+  // written with zoom_to_fit with padding 0.1
+  const padding = 0.1
+  if (isPlaywright()) {
+    await engineStreamZoomToFit({ engineCommandManager, padding })
+  } else {
+    // If the scene is empty you cannot use view_isometric, it will not move the camera
+    if (kclManager.isAstBodyEmpty(kclManager.ast)) {
+      await engineViewIsometricWithoutGeometryPresent({
+        engineCommandManager,
+        unit:
+          kclManager.fileSettings.defaultLengthUnit ||
+          DEFAULT_DEFAULT_LENGTH_UNIT,
+      })
+    } else {
+      await engineViewIsometricWithGeometryPresent({
+        engineCommandManager,
+        padding,
+      })
+    }
+  }
+}