Expand Google Test coverage across core subsystems

Add and extend unit tests for:
- Task manager (failed tasks, progress signals, multiple tasks)
- Undo stack (multiple undo/redo, push-after-undo, clear, multi-command)
- Config defaults and graphics backend string conversion
- Node keyframe serialization and default state
- Node value string round-trips and table operations
- Node globals and project settings/serialization
- Timeline coordinate, workarea, and marker commands
- Color LUT processor and OCIO transform handling
- Common utilities (range, file functions, Qt helpers, XML utils)
- Render enums (loop mode, alpha association)
- Shader resource availability
- Module smoke tests for Tool and HumanStrings

All tests pass including RenderWorkerFootage GPU worker tests after
rebuilding the stale olive-render-worker binary.

tests/gtest/node_value_test.cpp

@@ -48,3 +48,80 @@ TEST(NodeValue, BinaryRoundTrip)
 		olive::NodeValue::kBinary, encoded, false);
 	EXPECT_EQ(decoded.toByteArray(), data);
 }
+
+TEST(NodeValue, TypeClassification)
+{
+	EXPECT_TRUE(olive::NodeValue::type_can_be_interpolated(olive::NodeValue::kFloat));
+	EXPECT_TRUE(olive::NodeValue::type_can_be_interpolated(olive::NodeValue::kColor));
+	EXPECT_FALSE(olive::NodeValue::type_can_be_interpolated(olive::NodeValue::kInt));
+
+	EXPECT_TRUE(olive::NodeValue::type_is_numeric(olive::NodeValue::kInt));
+	EXPECT_TRUE(olive::NodeValue::type_is_numeric(olive::NodeValue::kFloat));
+	EXPECT_FALSE(olive::NodeValue::type_is_numeric(olive::NodeValue::kText));
+
+	EXPECT_TRUE(olive::NodeValue::type_is_vector(olive::NodeValue::kVec2));
+	EXPECT_TRUE(olive::NodeValue::type_is_vector(olive::NodeValue::kVec3));
+	EXPECT_FALSE(olive::NodeValue::type_is_vector(olive::NodeValue::kFloat));
+
+	EXPECT_TRUE(olive::NodeValue::type_is_buffer(olive::NodeValue::kTexture));
+	EXPECT_TRUE(olive::NodeValue::type_is_buffer(olive::NodeValue::kSamples));
+	EXPECT_FALSE(olive::NodeValue::type_is_buffer(olive::NodeValue::kColor));
+}
+
+TEST(NodeValue, DataTypeNameRoundTrip)
+{
+	for (int i = olive::NodeValue::kNone; i < olive::NodeValue::kDataTypeCount; ++i) {
+		auto type = static_cast<olive::NodeValue::Type>(i);
+		QString name = olive::NodeValue::GetDataTypeName(type);
+		if (name.isEmpty()) {
+			continue;
+		}
+		EXPECT_EQ(olive::NodeValue::GetDataTypeFromName(name), type)
+			<< name.toStdString();
+	}
+}
+
+TEST(NodeValue, ConstructionAndAccessors)
+{
+	olive::NodeValue val(olive::NodeValue::kInt, static_cast<int64_t>(42));
+	EXPECT_EQ(val.type(), olive::NodeValue::kInt);
+	EXPECT_EQ(val.toInt(), 42);
+	EXPECT_TRUE(val);
+
+	val.set_tag(QStringLiteral("tag"));
+	EXPECT_EQ(val.tag(), QStringLiteral("tag"));
+}
+
+TEST(NodeValueTable, PushAndGet)
+{
+	olive::NodeValueTable table;
+	olive::NodeValue v(olive::NodeValue::kFloat, 3.14);
+	table.Push(v);
+
+	EXPECT_EQ(table.Count(), 1);
+	EXPECT_FALSE(table.isEmpty());
+	EXPECT_TRUE(table.Has(olive::NodeValue::kFloat));
+
+	olive::NodeValue got = table.Get(olive::NodeValue::kFloat);
+	EXPECT_DOUBLE_EQ(got.toDouble(), 3.14);
+}
+
+TEST(NodeValueTable, TakeRemovesValue)
+{
+	olive::NodeValueTable table;
+	table.Push(olive::NodeValue(olive::NodeValue::kInt, static_cast<int64_t>(1)));
+	table.Push(olive::NodeValue(olive::NodeValue::kInt, static_cast<int64_t>(2)));
+
+	olive::NodeValue taken = table.Take(olive::NodeValue::kInt);
+	EXPECT_EQ(taken.toInt(), 2);
+	EXPECT_EQ(table.Count(), 1);
+}
+
+TEST(NodeValueTable, ClearEmptiesTable)
+{
+	olive::NodeValueTable table;
+	table.Push(olive::NodeValue(olive::NodeValue::kText, QStringLiteral("hello")));
+	table.Clear();
+	EXPECT_TRUE(table.isEmpty());
+	EXPECT_EQ(table.Count(), 0);
+}