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;

interfaces/Crafter.Graphics-FontAtlas.cppm

@@ -100,11 +100,13 @@ export namespace Crafter {
         FontAtlas() = default;
         FontAtlas(const FontAtlas&) = delete;
         FontAtlas& operator=(const FontAtlas&) = delete;
-        // The image goes with the atlas. The owner waits for the GPU first
-        // and, in sets mode, destroys the heap holding the image's view before
-        // the atlas.
+        // The image goes with the atlas, once the GPU is done with it; in
+        // sets mode the owner destroys the heap holding the image's view
+        // before the atlas.
         ~FontAtlas() {
-            if (image.image != VK_NULL_HANDLE) image.Destroy();
+            if (image.image == VK_NULL_HANDLE) return;
+            if (Device::queue != VK_NULL_HANDLE) vkQueueWaitIdle(Device::queue);
+            image.Destroy();
         }
 #endif