Give a viewer with no renderer an effects port, as cameras get

The renderer bridge builds and keeps an effects port over a viewer no
renderer is bound to, with a factory the Cesium effects module provides,
so visual settings on a consumer's own viewer draw their styles, bloom
and sharpen as before and give the scene's bloom back when destroyed.
The application shell loads the factory; a test checks every export
that reaches the effects lookup loads it.

scripts/package-boundaries.json

@@ -1000,6 +1000,7 @@
       "src/styles/surveillance.js",
       "src/styles/thermal.js",
       "src/ui/applicationShell.js",
+      "src/render/cesium/effects.js",
       "src/data/followed.js",
       "src/render/cesium/camera.js",
       "src/render/cesium/credits.js",