Use app foreground color for focus outline button color so there's no hue collision (#4894)

Towards #4851

public/kcl-samples-manifest-fallback.json

@@ -84,6 +84,11 @@
     "title": "Hex nut",
     "description": "A hex nut is a type of fastener with a threaded hole and a hexagonal outer shape, used in a wide variety of applications to secure parts together. The hexagonal shape allows for a greater torque to be applied with wrenches or tools, making it one of the most common nut types in hardware."
   },
+  {
+    "file": "i-beam.kcl",
+    "title": "I-beam",
+    "description": "A structural metal beam with an I shaped cross section. Often used in construction"
+  },
   {
     "file": "kitt.kcl",
     "title": "Kitt",