fix: render image borders in the layout painter

[jan-kubica]

Image border attrs already lived on the ProseMirror image node (borderWidth / borderColor / borderStyle), but the paged layout painter ignored them, so borders had no visual effect.

Changes

• Propagate border attrs through ImageRun / ImageBlock
• Apply CSS borders when painting floating, inline, block, cropped, and rotated images
• Keep folio's borderStyle naming throughout

  

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Configuration used: Organization UI

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📥 Commits

Reviewing files that changed from the base of the PR and between 3229068 and 85de0ac.

📒 Files selected for processing (9)

• .changeset/eigenpal-image-border-rendering.md
• api-reports/core/layout-engine.api.md
• packages/core/src/layout-bridge/convert/toFlowBlocks-image-borders.test.ts
• packages/core/src/layout-bridge/convert/toFlowBlocks.ts
• packages/core/src/layout-engine/types.ts
• packages/core/src/layout-painter/renderImage-opacity.test.ts
• packages/core/src/layout-painter/renderImage.ts
• packages/core/src/layout-painter/renderParagraph.ts
• packages/core/src/prosemirror/extensions/nodes/ImageExtension.test.ts

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• Commit unit tests in branch cursor/eigenpal-image-borders-6b1a

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[gemini-code-assist]

Code Review

This pull request ports image border rendering through layout painting by introducing border attributes (borderWidth, borderColor, borderStyle) to the layout engine types, preserving them during document conversion, and implementing border painting in the layout painter. The review feedback highlights a critical issue where borders applied directly to cropped elements are clipped and rendered invisible. To resolve this, the reviewer suggests updating applyImageBorder to accept generic HTMLElements and conditionally applying the border to the container element when cropping is active.

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