build/ci: green builds and tests on all three platforms

Compiler hygiene (all platforms):
- Silence warnings across the tree: missing override, -Wreorder ctor
  init, -Wshadow, -Wsign-compare, missing switch cases, unused
  functions/captures, Qt 6.11 deprecations (QMouseEvent/QDropEvent
  accessors, qAsConst, Q_FOREACH over non-shared containers,
  AA_UseHighDpiPixmaps) and the .bak/ backup tree removal.
- Fix regressions from the cleanup: missing clip decls in
  capi/timeline.cpp, plugin.cpp rename fallout, panel setFocus
  ambiguity, QGraphicsItem::pos vs event->position(), duplicate
  k_push_button case, boolean test variable.

Windows:
- Qt portability: CommandLineParser is_set/add_option, QTimeZone
  systemTimeZone (QTimeZone::LocalTime is 6.11-only), k_progress_* enum.
- Linking: stop adding oakengine to OLIVE_LIBRARIES (import lib plus
  oakengine-obj caused multiple definitions); add OAKENGINE_STATIC so
  internal consumers no longer reference __imp_* stubs.
- oakengine.ver: export olive::Renderer typeinfo so liboakgl.so can be
  dlopened (Linux), DynamicRenderer no longer dlcloses backend libraries
  (crash in RenderManager's dtor calling into unmapped memory).
- OTIO runtime: copy DLLs next to every binary on Windows instead of
  relying on PATH (0xc0000135 in gtest discovery).
- Headless GL: the runner only has GDI OpenGL 1.1, killing every render
  worker. Deploy Mesa llvmpipe as opengl32sw.dll (Qt's software-GL
  channel) with QT_OPENGL=software, and let QT_OPENGL override the
  AA_UseDesktopOpenGL default. ExportTask fails fast after 8 consecutive
  undelivered frames instead of segfaulting or grinding forever;
  FFmpegEncoder::write_frame tolerates null frames.
- Tests: GetTempPathA+PID temp dirs, GetLongPathNameA for 8.3 names,
  forward-slash normalization when comparing project filenames.

Linux:
- Install libshaderc-dev so oakvulkan compiles GLSL (Vulkan tests).
- Accept UNORM floor-or-round (63/64) in the blit ping-pong test.
- Skip MainWindow construction test on the offscreen QPA (cannot paint
  QOpenGLWidget).

Also: oak_cli_transcode gets a 300s ctest timeout, worker logs GL
context version and LoadGraph/render_frame stages, and
docs/plans/eliminate-event-bridge-issues.md (English translation).

engine/node/node.cpp

@@ -2386,14 +2386,14 @@ TimeRange Node::transform_time_to(TimeRange time, Node *target,
 	Node *from = this;
 	Node *to = target;
 
-	if (dir == k_transform_towards_input) {
+	if (dir == k_towards_input) {
 		std::swap(from, to);
 	}
 
 	std::list<NodeInput> path = find_path(from, to, path_index);
 
 	if (!path.empty()) {
-		if (dir == k_transform_towards_input) {
+		if (dir == k_towards_input) {
 			for (auto it = path.crbegin(); it != path.crend(); it++) {
 				const NodeInput &i = (*it);
 				time = i.node()->input_time_adjustment(i.input(), i.element(),
@@ -2614,7 +2614,7 @@ void Node::invalidate_from_keyframe_time_change()
 
 	// Invalidate entire area surrounding the keyframe (either where it currently is, or where it used to be before it
 	// was resorted in the if block above)
-	foreach (const TimeRange &r, invalidate_range) {
+	for (const TimeRange &r : invalidate_range) {
 		parameter_value_changed(key->key_track_ref().input(), r);
 	}
 

engine/node/node.h

@@ -929,8 +929,8 @@ public:
 	static QString get_category_name(const CategoryID &c);
 
 	enum TransformTimeDirection {
-		k_transform_towards_input,
-		k_transform_towards_output
+		k_towards_input,
+		k_towards_output
 	};
 
 	/**

engine/node/plugins/plugin.cpp

@@ -232,8 +232,6 @@ QHash<QString, QVariant> build_default_values(
 			ofx_type == kOfxParamTypePushButton) {
 			continue;
 		}
-		const auto &props = param.second->getProperties();
-		bool is_secret = props.getIntProperty(kOfxParamPropSecret) != 0;
 		const QString input_id =
 			QString::fromStdString(param.second->getName());
 		if (input_id.isEmpty()) {
@@ -263,10 +261,10 @@ clip_label_for_name(const std::string &name,
 	}
 
 	if (desc) {
-		const std::string &label =
+		const std::string &param_label =
 			desc->getProps().getStringProperty(kOfxPropLabel);
-		if (!label.empty()) {
-			return QString::fromStdString(label);
+		if (!param_label.empty()) {
+			return QString::fromStdString(param_label);
 		}
 	}
 
@@ -432,9 +430,9 @@ olive::plugin::PluginNode::PluginNode(OFX::Host::ImageEffect::Instance *plugin)
 			const int value_count = props.getDimension(kOfxParamPropChoiceEnum);
 
 			for (int i = 0; i < label_count; ++i) {
-				const std::string &label =
+				const std::string &choice_label =
 					props.getStringProperty(kOfxParamPropChoiceOption, i);
-				option_labels.append(QString::fromStdString(label));
+				option_labels.append(QString::fromStdString(choice_label));
 			}
 
 			for (int i = 0; i < value_count; ++i) {

engine/node/plugins/plugin.h

@@ -62,7 +62,7 @@ public:
    */
 	virtual void process_samples(const NodeValueRow &values,
 								const SampleBuffer &input, SampleBuffer &output,
-								int index) const;
+								int index) const override;
 
 	/**
    * @brief If Value() pushes a GenerateJob, override this function for the image to create
@@ -71,7 +71,7 @@ public:
    *
    * The destination buffer. It will already be allocated and ready for writing to.
    */
-	virtual void generate_frame(FramePtr frame, const GenerateJob &job) const;
+	virtual void generate_frame(FramePtr frame, const GenerateJob &job) const override;
 
 private:
 	QString sub_category_;

engine/node/project/footage/footage.cpp

@@ -377,8 +377,8 @@ void Footage::value(const NodeValueRow &value, const NodeGlobals &globals,
 					this, QStringLiteral("length"));
 
 		// Push each stream as a footage job
-		for (int i = 0; i < get_total_stream_count(); i++) {
-			Track::Reference ref = get_reference_from_real_index(i);
+		for (int si = 0; si < get_total_stream_count(); si++) {
+			Track::Reference ref = get_reference_from_real_index(si);
 			FootageJob job(globals.time(), decoder_, filename(), ref.type(),
 						   get_length(), globals.loop_mode());
 
@@ -427,9 +427,10 @@ void Footage::value(const NodeValueRow &value, const NodeGlobals &globals,
 						ProxyManager::k_proxy_ready &&
 					ProxyManager::proxy_filename_has_audio(proxy_path_)) {
 					int audio_rank = 0;
-					for (int i = 0; i < get_total_stream_count(); i++) {
+					for (int sj = 0; sj < get_total_stream_count(); sj++) {
 						const Track::Reference other =
-							get_reference_from_real_index(i);
+							get_reference_from_real_index(sj);
+
 						if (other.type() == Track::k_audio &&
 							get_audio_params(other.index()).stream_index() <
 								ap.stream_index()) {
@@ -448,8 +449,8 @@ void Footage::value(const NodeValueRow &value, const NodeGlobals &globals,
 		// Media is offline: push a generated warning frame for each video
 		// stream so missing media is clearly visible in the timeline instead
 		// of a transparent/black hole. generate_frame() draws the slat.
-		for (int i = 0; i < get_total_stream_count(); i++) {
-			Track::Reference ref = get_reference_from_real_index(i);
+		for (int si = 0; si < get_total_stream_count(); si++) {
+			Track::Reference ref = get_reference_from_real_index(si);
 			if (ref.type() != Track::k_video) {
 				continue;
 			}

engine/node/project/serializer/serializedlayoutinfo.cpp

@@ -28,7 +28,7 @@ void SerializedLayoutInfo::to_xml(QXmlStreamWriter *writer) const
 
 	writer->writeStartElement(QStringLiteral("folders"));
 
-	foreach (Folder *folder, open_folders) {
+	for (Folder *folder : open_folders) {
 		writer->writeTextElement(
 			QStringLiteral("folder"),
 			QString::number(reinterpret_cast<quintptr>(folder)));
@@ -38,7 +38,7 @@ void SerializedLayoutInfo::to_xml(QXmlStreamWriter *writer) const
 
 	writer->writeStartElement(QStringLiteral("timeline"));
 
-	foreach (Sequence *sequence, open_sequences) {
+	for (Sequence *sequence : open_sequences) {
 		writer->writeTextElement(
 			QStringLiteral("sequence"),
 			QString::number(reinterpret_cast<quintptr>(sequence)));
@@ -48,7 +48,7 @@ void SerializedLayoutInfo::to_xml(QXmlStreamWriter *writer) const
 
 	writer->writeStartElement(QStringLiteral("viewers"));
 
-	foreach (ViewerOutput *viewer, open_viewers) {
+	for (ViewerOutput *viewer : open_viewers) {
 		writer->writeTextElement(
 			QStringLiteral("viewer"),
 			QString::number(reinterpret_cast<quintptr>(viewer)));

engine/node/time/timeformat/timeformat.cpp

@@ -22,6 +22,7 @@
 #include "timeformat.h"
 
 #include <QDateTime>
+#include <QTimeZone>
 
 namespace olive
 {
@@ -75,7 +76,8 @@ void TimeFormatNode::value(const NodeValueRow &value,
 	qint64 ms_since_epoch = value[k_time_input].to_double() * 1000;
 	bool time_is_local = value[k_local_time_input].to_bool();
 	QDateTime dt = QDateTime::fromMSecsSinceEpoch(
-		ms_since_epoch, time_is_local ? Qt::LocalTime : Qt::UTC);
+		ms_since_epoch,
+		time_is_local ? QTimeZone::systemTimeZone() : QTimeZone::utc());
 	QString format = value[k_format_input].to_string();
 	QString output = dt.toString(format);
 	table->push(NodeValue(NodeValue::k_text, output, this));

engine/node/traverser.cpp

@@ -502,9 +502,7 @@ void NodeTraverser::resolve_jobs(NodeValue &val)
 						}
 
 						val.set_value(tex);
-					} else if (plugin::PluginJob *plugin_job =
-								   dynamic_cast<plugin::PluginJob *>(
-									   base_job)) {
+					} else if (dynamic_cast<plugin::PluginJob *>(base_job)) {
 						VideoParams tex_params = job_tex->params();
 						// Force internal working format (F32) for plugin processing,
 						// matching FootageJob/GenerateJob behavior.