feat: Add theme prop (#3228)

* support appearance when updating scene data

* works!

* whoops, missed a prop

* hide appearance button when prop is not set

* cleanup

* fix export + rename prop to theme

* rename to showThemeBtn, hide via react instead of css

* adapt to new state name

* add tests and css selector to target the dark mode toggle

* updated changelog and readme

* fix markdown rendering in readme

* pr feedback

src/components/MobileMenu.tsx

@@ -30,6 +30,7 @@ type MobileMenuProps = {
   isCollaborating: boolean;
   renderCustomFooter?: (isMobile: boolean) => JSX.Element;
   viewModeEnabled: boolean;
+  showThemeBtn: boolean;
 };
 
 export const MobileMenu = ({
@@ -45,6 +46,7 @@ export const MobileMenu = ({
   isCollaborating,
   renderCustomFooter,
   viewModeEnabled,
+  showThemeBtn,
 }: MobileMenuProps) => {
   const renderToolbar = () => {
     return (
@@ -130,6 +132,7 @@ export const MobileMenu = ({
             actionManager={actionManager}
             appState={appState}
             setAppState={setAppState}
+            showThemeBtn={showThemeBtn}
           />
         }
       </>