Lf94/eco mode save the planet (#2940)

* Trigger shutdown operations after each test

* Idle mode states

* Don't show the reconnect when coming back from tab

src/lib/singletons.ts

@@ -9,6 +9,10 @@ export const codeManager = new CodeManager()
 
 export const engineCommandManager = new EngineCommandManager()
 
+// Accessible for tests mostly
+// @ts-ignore
+window.tearDown = engineCommandManager.tearDown
+
 // This needs to be after codeManager is created.
 export const kclManager = new KclManager(engineCommandManager)
 kclManager.isFirstRender = true