Make switch statements over enums in engine source use a typed expression to support compiler checking of full coverage.

PiperOrigin-RevId: 556854229
Change-Id: I36a5d146d776e10b946e2f9b51ace4ef3866471b

src/engine/engine_vis_init.c

@@ -354,7 +354,7 @@ float mjv_rbound(const mjvGeom* geom) {
 
   // compute rbound according to type
   const float* s = geom->size;
-  switch (geom->type) {
+  switch ((mjtMouse) geom->type) {
   case mjGEOM_SPHERE:
     return s[0];