feat: rewrite public UI component rendering using tunnels (#6117)

* feat: rewrite public UI component rendering using tunnels

* factor out into components

* comments

* fix variable naming

* fix not hiding welcomeScreen

* factor out AppFooter and memoize components

* remove `UIOptions.welcomeScreen` and render only from host app

* factor out tunnels into own file

* update changelog. Keep `UIOptions.welcomeScreen` as deprecated

* update changelog

* lint

---------

Co-authored-by: Aakansha Doshi <aakansha1216@gmail.com>

src/components/App.tsx

@@ -589,7 +589,6 @@ class App extends React.Component<AppProps, AppState> {
                         })
                       }
                       langCode={getLanguage().code}
-                      isCollaborating={this.props.isCollaborating}
                       renderTopRightUI={renderTopRightUI}
                       renderCustomStats={renderCustomStats}
                       renderCustomSidebar={this.props.renderSidebar}
@@ -605,7 +604,6 @@ class App extends React.Component<AppProps, AppState> {
                       onImageAction={this.onImageAction}
                       renderWelcomeScreen={
                         !this.state.isLoading &&
-                        this.props.UIOptions.welcomeScreen &&
                         this.state.showWelcomeScreen &&
                         this.state.activeTool.type === "selection" &&
                         !this.scene.getElementsIncludingDeleted().length