Tim Ledbetter e495db44d5 LibWeb: Notify only affected layout nodes when a CSS image loads ...

Previously, `Document::notify_css_background_image_loaded()` walked the
entire `PaintableBox` subtree and cleared each box's paintable cache
whenever any CSS image finished loading.

Replace this with per-image observers owned by the layout node. During
`apply_style`, each node registers as an `ImageStyleValue::Client` for
the images its style references. On load, only the affected layout
node's paintables are invalidated.

2026-04-29 04:33:35 +02:00

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