Refactor the 'Fill' and 'Stroke' nodes to set "fill" and "stroke" attributes for paints (#4257)

* Allow using any graphics type for fill

* Adapt gradient/fill property panels and tools to handle List<T>

* Make the initial gradient transform covers the target's bounding box

* Introduce AnyGraphicListDyn to avoid combinatorial explosion

* Allow using any graphics type for stroke paint

* Add FIll node migration

* Add `for_each_vector_list_mut` instead of `set_paint_attribute`

* Adapt paint flow to read and write attributes instead of legacy Fill/Stroke.color

* Fix responsibilities of paint related node input setters

* Fix Morph by storing List<Graphic> for attributes rather than the concrete types

Store fill/stroke paints as List<Graphic> so Color/Gradient transitions
do not hit set_attribute_value_dyn's type-mismatch fallback to default paint.

* Preserve paint attributes in vector editing ops

* Enhance the clarity between direct and chained fill gradients

* Update demo arts

* Consolidate Fill node gradient appearance inputs

* Fix after the cubic review

* Revert "Consolidate Fill node gradient appearance inputs"

This reverts commit 9622feb20196e2c4da99e98ca95dcc2e34c2c98e.

* Replace AnyGraphicListDyn with generic paint connectors on the Fill and Stroke nodes

* Canonicalize paint attribute storage to List<Graphic> with a single write helper

* Fix Solidify Stroke missing fills stored in the legacy style

* Fix Solidify Stroke producing invisible strokes for legacy-only stroke colors

* Fix the initial gradient transform ignoring the bounding box's vertical extent

* Step paint at the morph midpoint instead of dropping it for unmixable pairings

* Remove migration-stage comments

* Clarify the initial gradient transform helper's doc and name

* Correct the bake_paint_transforms doc and prune dead tolerance arms

* Delete the unused Gradient::lerp

* Fix a comment typo

* Thread network paths through the legacy gradient bake so nested fills migrate

* Restore the legacy fill fallback in Expand Fill and Stroke

* Read gradient stops from the node's own input in the Fill properties panel

* Use the transform input constant instead of a hardcoded index

* Remove the unreachable wired color fallback in the Fill properties solid branch

* Narrow the fill overlay redraw check to actual fill inputs

* Coalesce the fill setter's graph runs into a single dispatch

* Position the Gradient Value node inserted for gradient stops

* Bake backup gradient placement during migration

* Persist pending gradient bakes so unfinished migrations retry on reopen

* Migrate the backup gradient's type and spread method

* Harden the gradient-migration pass against document switches and stale bakes

* Keep the Fill properties UI for layerless and nested Fill nodes

* Leave a wired gradient transform input connected instead of overwriting it

* Refuse to start a gradient chain ahead of existing layer content

* Decode a Fill node's gradient through one shared reader

* Nudge a degenerate bounding box so the Fill gradient transform stays invertible

* Broadcast Fill and Stroke paint with a single attribute-column pass

* Fix Morph stepping the target's stroke in near the source instead of the target

* Tidy conventions: clippy get_first, comment periods, sentence-case test messages

* Reattach the gradient orientation doc to its function

* Re-save demo artwork

---------

Co-authored-by: Keavon Chambers <keavon@keavon.com>

node-graph/graph-craft/src/document/value.rs

@@ -402,6 +402,7 @@ tagged_value! {
 	DVec2(DVec2),
 	#[serde(alias = "Affine2")]
 	DAffine2(DAffine2),
+	OptionalDAffine2(Option<DAffine2>),
 	FillGradient(Gradient),
 	Font(Font),
 	Footprint(Footprint),
@@ -583,6 +584,8 @@ impl TaggedValue {
 					// `Color` (not in a `List`) is still currently needed by `BlackAndWhiteNode` and `ColorOverlayNode` GPU `shader_node(PerPixelAdjust)` variants
 					() if ty == TypeId::of::<Color>() => to_color(string).map(|color| TaggedValue::Color(Some(color)))?,
 					() if ty == TypeId::of::<List<Color>>() => to_color(string).map(|color| TaggedValue::Color(Some(color)))?,
+					// The Fill and Stroke nodes' paint connectors default to `List<Graphic>`, their first registered implementation row
+					() if ty == TypeId::of::<List<Graphic>>() => to_color(string).map(|color| TaggedValue::Color(Some(color)))?,
 					() if ty == TypeId::of::<List<GradientStops>>() => to_gradient(string).map(TaggedValue::Gradient)?,
 					() if ty == TypeId::of::<Fill>() => to_color(string).map(|color| TaggedValue::Fill(Fill::solid(color)))?,
 					() if ty == TypeId::of::<ReferencePoint>() => to_reference_point(string).map(TaggedValue::ReferencePoint)?,