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).

app/widget/handmovableview/handmovableview.cpp

@@ -64,8 +64,10 @@ bool HandMovableView::hand_press(QMouseEvent *event)
 		setInteractive(false);
 
 		// Transform mouse event to act like the left button is pressed
-		QMouseEvent transformed(event->type(), event->pos(), Qt::LeftButton,
-								Qt::LeftButton, event->modifiers());
+		QMouseEvent transformed(event->type(), event->position(),
+								event->globalPosition(), Qt::LeftButton,
+								Qt::LeftButton, event->modifiers(),
+								event->pointingDevice());
 
 		transformed_pos_ = QPoint(0, 0);
 
@@ -83,22 +85,24 @@ bool HandMovableView::hand_move(QMouseEvent *event)
 		// Transform mouse event to act like the left button is pressed
 		QPoint adjustment(0, 0);
 
-		QMouseEvent transformed(event->type(), event->pos() - transformed_pos_,
-								Qt::LeftButton, Qt::LeftButton,
-								event->modifiers());
+		QMouseEvent transformed(event->type(),
+								event->position() - transformed_pos_,
+								event->globalPosition(), Qt::LeftButton,
+								Qt::LeftButton, event->modifiers(),
+								event->pointingDevice());
 
-		if (event->pos().x() < 0) {
+		if (event->position().toPoint().x() < 0) {
 			transformed_pos_.setX(transformed_pos_.x() + width());
 			adjustment.setX(width());
-		} else if (event->pos().x() >= width()) {
+		} else if (event->position().toPoint().x() >= width()) {
 			transformed_pos_.setX(transformed_pos_.x() - width());
 			adjustment.setX(-width());
 		}
 
-		if (event->pos().y() < 0) {
+		if (event->position().toPoint().y() < 0) {
 			transformed_pos_.setY(transformed_pos_.y() + height());
 			adjustment.setY(height());
-		} else if (event->pos().y() >= height()) {
+		} else if (event->position().toPoint().y() >= height()) {
 			transformed_pos_.setY(transformed_pos_.y() - height());
 			adjustment.setY(-height());
 		}
@@ -116,8 +120,8 @@ bool HandMovableView::hand_release(QMouseEvent *event)
 {
 	if (dragging_hand_) {
 		// Transform mouse event to act like the left button is pressed
-		QMouseEvent transformed(event->type(), event->localPos(),
-								event->windowPos(), event->screenPos(),
+		QMouseEvent transformed(event->type(), event->position(),
+								event->scenePosition(), event->globalPosition(),
 								Qt::LeftButton, Qt::LeftButton,
 								event->modifiers(), event->source());
 
@@ -194,7 +198,7 @@ void HandMovableView::wheelEvent(QWheelEvent *event)
 #if (QT_VERSION >= QT_VERSION_CHECK(5, 14, 0))
 			event->position(), event->globalPosition(),
 #else
-			event->pos(), event->globalPos(),
+			event->position().toPoint(), event->globalPos(),
 #endif
 			event->pixelDelta(), angle_delta, event->buttons(),
 			event->modifiers(), event->phase(), event->inverted(),
@@ -209,7 +213,7 @@ void HandMovableView::wheelEvent(QWheelEvent *event)
 															Qt::Horizontal;
 		}
 
-		QWheelEvent e(event->pos(), event->globalPos(), event->pixelDelta(),
+		QWheelEvent e(event->position().toPoint(), event->globalPos(), event->pixelDelta(),
 					  event->angleDelta(), event->delta(), orientation,
 					  event->buttons(), event->modifiers());
 #endif