Follow up: Stream Idle PR (#6238)

* Use a dropdown for stream idle setting

* Add support for undefined values in dropdowns

* Move cache bust to the beginning of engine open for reconnections

* yarn tsc

* Don't setup model feature highlighters until the connection is ready

* Wait 2s to give engine time to serve video, then listen for modeling commands

* Undo teardown

* yarn fmt

* Fix circular module dependency; fmt & lint & tsc

* Fix editor-test waiting for 2 instead of 1

* Increment another 2 numbers ...

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Co-authored-by: Pierre Jacquier <pierrejacquier39@gmail.com>

src/components/Settings/SettingsFieldInput.tsx

@@ -101,7 +101,10 @@ export function SettingsFieldInput({
               type: `set.${category}.${settingName}`,
               data: {
                 level: settingsLevel,
-                value: e.target.value,
+                // undefined is the only special string due to no way to
+                // encode it in the string-only options.
+                value:
+                  e.target.value === 'undefined' ? undefined : e.target.value,
               },
             } as unknown as EventFrom<WildcardSetEvent>)
           }