The Fill section was single-fill (header "+" only reset one solid, row "×"
cleared but a default row re-rendered). Now it's a Figma-style stacked list:
"+" appends a fill, each fill renders its own head row (swatch + type
dropdown + opacity% + ×), and "×" removes that specific fill. Built on the
indexed model ops from 17310556; mirrors the Effects multi-item pattern.
- snapshot: NodeSnapshot.fills: Vec<FillSummary>; legacy fields derived from
fills[0]; walkers thread fills: &[FillSummary] (VisibleSections stays Copy).
- actions: RemoveFill(usize), SetFillType{index,fill_type},
ToggleFillTypePicker(usize), OpenFillColorPicker(usize).
- state: PropertyFocus::FillHex/FillOpacity carry a fill index;
ColorPickerState.fill_index indexes the HSV writeback (ColorTarget unchanged).
- paint/hit/height loop per fill in lockstep (paint_one_fill,
push_fill_action_rects, fills_section_height); both hosts dispatch by index.
Backward compatible (fill is already Vec<PenFill>; old single-fill .op loads
as one row). Non-primary gradient/image fills are head-row-only for now
(editable gradient/image body stays primary-fill-only to avoid the ColorTarget
ripple); solid color/opacity/type are fully per-index.
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