[UI] Eliminate mouse requirement for initial profile create dialogs

Enable keyboard navigation and accept Enter to complete profile creation

src/xenia/app/profile_dialogs.cc

@@ -61,6 +61,9 @@ void NoProfileDialog::OnDraw(ImGuiIO& io) {
   const auto content_files = xe::filesystem::ListDirectories(
       emulator_window_->emulator()->content_root());
 
+  if (ImGui::IsWindowAppearing()) {
+    ImGui::SetKeyboardFocusHere();
+  }
   if (content_files.empty()) {
     if (ImGui::Button("Create Profile")) {
       new kernel::xam::ui::CreateProfileUI(emulator_window_->imgui_drawer(),

src/xenia/kernel/xam/ui/create_profile_ui.cc

@@ -38,12 +38,13 @@ void CreateProfileUI::OnDraw(ImGuiIO& io) {
   }
 
   ImGui::TextUnformatted("Gamertag:");
-  if (ImGui::InputText("##Gamertag", gamertag_, sizeof(gamertag_))) {
-    valid_gamertag_ = profile_manager->IsGamertagValid(std::string(gamertag_));
-  }
+  const bool enter_pressed =
+      ImGui::InputText("##Gamertag", gamertag_, sizeof(gamertag_),
+                       ImGuiInputTextFlags_EnterReturnsTrue);
+  valid_gamertag_ = profile_manager->IsGamertagValid(std::string(gamertag_));
 
   ImGui::BeginDisabled(!valid_gamertag_);
-  if (ImGui::Button("Create")) {
+  if (ImGui::Button("Create") || (enter_pressed && valid_gamertag_)) {
     bool autologin = (profile_manager->GetAccountCount() == 0);
     if (profile_manager->CreateProfile(std::string(gamertag_), autologin,
                                        migration_) &&

src/xenia/ui/imgui_drawer.cc

@@ -162,6 +162,7 @@ void ImGuiDrawer::Initialize() {
 
   auto& io = ImGui::GetIO();
   io.ConfigFlags |= ImGuiConfigFlags_NavEnableGamepad;
+  io.ConfigFlags |= ImGuiConfigFlags_NavEnableKeyboard;
 
   const float font_size = std::max((float)cvars::font_size, 8.f);
   const float title_font_size = font_size + 6.f;