Refactor editor rendering contracts

tests/UI/Editor/unit/test_project_panel.cpp

@@ -1,5 +1,5 @@
 #include "Project/ProjectPanel.h"
-#include "Assets/BuiltInIcons.h"
+#include "Assets/EditorIconService.h"
 #include "SystemInteractionService.h"
 
 #include "Panels/EditorPanelIds.h"
@@ -40,6 +40,33 @@ public:
     std::filesystem::path lastRevealPath = {};
 };
 
+class FakeIconService final : public EditorIconService {
+public:
+    void Initialize(
+        Rendering::Host::UiTextureHost&,
+        Host::EditorHostResourceService&) override {}
+    void Shutdown() override {}
+    void BeginFrame() override {}
+
+    const ::XCEngine::UI::UITextureHandle& Resolve(BuiltInIconKind) const override {
+        return texture;
+    }
+
+    const ::XCEngine::UI::UITextureHandle* ResolveAssetPreview(
+        const std::filesystem::path&,
+        const std::filesystem::path&) override {
+        return nullptr;
+    }
+
+    const std::string& GetLastError() const override {
+        return error;
+    }
+
+private:
+    ::XCEngine::UI::UITextureHandle texture = {};
+    std::string error = {};
+};
+
 class TemporaryRepo final {
 public:
     TemporaryRepo() {
@@ -249,13 +276,13 @@ TEST(ProjectPanelTests, InjectedRuntimeCurrentFolderDrivesRenameFallbackWithoutT
     EXPECT_EQ(evaluation.message, "Rename project item 'FolderA'.");
 }
 
-TEST(ProjectPanelTests, BuiltInIconsCanBeConfiguredBeforeRuntimeInitialization) {
+TEST(ProjectPanelTests, IconServiceCanBeConfiguredBeforeRuntimeInitialization) {
     TemporaryRepo repo = {};
 
     ProjectPanel panel = {};
-    BuiltInIcons icons = {};
+    FakeIconService icons = {};
 
-    panel.SetBuiltInIcons(&icons);
+    panel.SetIconService(&icons);
     panel.Initialize(repo.Root());
 
     const UIEditorHostCommandEvaluationResult evaluation =