chore: snapshot editor work and restore tests

Key points:\n- restore the tests tree removed by bc47e6e\n- capture current editor workspace, scene, and docs reshuffle changes\n- keep local cloud.nvdb resources ignored from this commit

tests/editor/test_builtin_icon_layout_utils.cpp

@@ -0,0 +1,40 @@
+#include <gtest/gtest.h>
+
+#include "UI/BuiltInIconLayoutUtils.h"
+
+namespace {
+
+using XCEngine::Editor::UI::ComputeFittedIconSize;
+
+TEST(BuiltInIconLayoutUtilsTest, ReturnsZeroWhenTextureOrBoundsAreInvalid) {
+    EXPECT_EQ(
+        ComputeFittedIconSize(0, 64, ImVec2(0.0f, 0.0f), ImVec2(64.0f, 64.0f)).x,
+        0.0f);
+    EXPECT_EQ(
+        ComputeFittedIconSize(64, 64, ImVec2(10.0f, 0.0f), ImVec2(10.0f, 64.0f)).y,
+        0.0f);
+}
+
+TEST(BuiltInIconLayoutUtilsTest, FitsWidthLimitedRegions) {
+    const ImVec2 size = ComputeFittedIconSize(
+        256,
+        128,
+        ImVec2(0.0f, 0.0f),
+        ImVec2(64.0f, 64.0f));
+
+    EXPECT_FLOAT_EQ(size.x, 64.0f);
+    EXPECT_FLOAT_EQ(size.y, 32.0f);
+}
+
+TEST(BuiltInIconLayoutUtilsTest, FitsHeightLimitedRegions) {
+    const ImVec2 size = ComputeFittedIconSize(
+        128,
+        256,
+        ImVec2(0.0f, 0.0f),
+        ImVec2(80.0f, 40.0f));
+
+    EXPECT_FLOAT_EQ(size.x, 20.0f);
+    EXPECT_FLOAT_EQ(size.y, 40.0f);
+}
+
+} // namespace