fix: bug-fix sweep across node, audio, render, plugin subsystems

Node core:
- MathNode/TrigonometryNode combo strings realigned with Operation enums
- mathbase scalar/vector operand pick no longer uses bitwise type checks
- NodeSetPositionAndDependenciesRecursively moves dependencies again
- RemoveAllKeyframes undo actually restores keyframes
- NodeGroup GetInputName null-deref guard, passthrough ids use input id
- NodeValueTable::Has is an exact type match; tag fallback only for
  empty tags; kStrCombo/kPushButton get data type names
- delete_all_keyframes no longer loops forever on unparented keyframes;
  keyframe-load failures propagate; rational interpolation falls back to
  double; OpacityEffect no longer leaks its internal MathNode

Audio/footage:
- AudioVisualWaveform: GetSummaryFromTime underflow OOB read, TrimIn
  prepend length bookkeeping, OverwriteSums source channel indexing
- PanNode inserts the pan value into the sample job (keyframed pan
  works); OutputParamsChanged is emitted on device change; PortAudio
  device indices are validated before Pa_GetDeviceInfo
- Footage: AdjustTimeByLoopMode no longer hangs/UBs on degenerate
  lengths, GetStreamIndex bounds-checked, CheckFootage clears stale
  state on missing files, failed probes are not cached,
  FootageDescription::Load requires its own root element

Render/track:
- ViewerOutput pushes the tagged samples value; TrackList disconnects
  the track-height lambda; GetTrackFromReference validity check
- RenderManager dummy backend: null-initialized threads, guarded
  decoder-cache/timer paths; Renderer::Destroy releases color cache
  shaders/textures; unknown dynamic backends no longer alias to oakgl
- SharedMemoryRegion POSIX attach validates segment size; ReadMessage
  skips blank lines instead of failing; GC counter clamped;
  IsRenderingCustomRange implemented; TimeOffsetNode gets a true
  inverse OutputTimeAdjustment; zero-speed clips return the held frame

Plugin/nodes:
- OliveClip: stored default region of definition is honored, on-demand
  images are cached; OliveHost sets host identity properties and logs
  instead of showing modal dialogs offscreen; Plugin.h dead decls gone
- DespillNode guards graph-less use with Rec.709 fallback; description
  typos fixed (despill, swirl); mosaic applies when only one axis
  matches; Windows-only Project filename separator test fixed

tests/gtest/node_time_test.cpp

@@ -184,22 +184,34 @@ TEST_F(NodeTimeTest, TimeOffsetZeroOffsetIsIdentity)
 			  range);
 }
 
-TEST_F(NodeTimeTest, TimeOffsetOutputAdjustmentPassesThrough)
+TEST_F(NodeTimeTest, TimeOffsetOutputAdjustmentAppliesInverseOffset)
 {
 	auto *offset = AddNode<olive::TimeOffsetNode>();
 	offset->SetStandardValue(olive::TimeOffsetNode::kTimeInput,
 							 QVariant::fromValue(olive::core::rational(3)));
 
-	// The inverse mapping is not implemented, so output time is never
-	// adjusted
+	// The inverse mapping subtracts the offset again: input-side times are
+	// mapped back to the output by the negated offset
+	EXPECT_EQ(offset->OutputTimeAdjustment(
+				  olive::TimeOffsetNode::kInputInput, -1,
+				  olive::TimeRange(olive::core::rational(2),
+								   olive::core::rational(4))),
+			  olive::TimeRange(olive::core::rational(-1),
+							   olive::core::rational(1)));
+
+	// Non-input inputs never adjust time
 	const olive::TimeRange range(olive::core::rational(2),
 								 olive::core::rational(4));
-	EXPECT_EQ(offset->OutputTimeAdjustment(olive::TimeOffsetNode::kInputInput,
-										   -1, range),
-			  range);
 	EXPECT_EQ(offset->OutputTimeAdjustment(olive::TimeOffsetNode::kTimeInput,
 										   -1, range),
 			  range);
+
+	// Round trip through both adjustments returns the original range
+	EXPECT_EQ(offset->OutputTimeAdjustment(
+				  olive::TimeOffsetNode::kInputInput, -1,
+				  offset->InputTimeAdjustment(
+					  olive::TimeOffsetNode::kInputInput, -1, range, true)),
+			  range);
 }
 
 TEST_F(NodeTimeTest, TimeOffsetAppliesKeyframedOffset)