fix(font-atlas): wait for the GPU before the image goes; DOM stubs for SetAppId and SetTextInput

~FontAtlas destroyed the image while frames that sample it could still
run (HelloUI declares the atlas after the window, so it goes first); it
waits on the queue now, as the descriptor heap does. The DOM build got
the two new Window methods as no-ops, like the other backend-specific
ones.

implementations/Crafter.Graphics-Window.cpp

@@ -1640,6 +1640,10 @@ void Window::SetTitle(const std::string_view title) {
     Crafter::DomEnv::domSetTitle(title.data(), static_cast<std::int32_t>(title.size()));
 }
 
+void Window::SetAppId(const std::string_view) {}
+
+void Window::SetTextInput(bool, std::int32_t, std::int32_t, std::int32_t, std::int32_t, TextInputPurpose) {}
+
 void Window::Resize(std::uint32_t newWidth, std::uint32_t newHeight) {
     if (newWidth == 0 || newHeight == 0) return;
     if (newWidth == width && newHeight == height) return;