figma-transformer: rebase component vector clone geometry

[chubes4]

Summary

• Rebase component-source clone descendants into their wrapper-local coordinate space before SVG/CSS emission.
• Preserve zero-origin SVG path/viewBox content while fixing wrapper CSS and visual-node map placement for nested vector and boolean descendants.
• Add synthetic nested vector/boolean component-source contract coverage.

Evidence

• composer test:contract passes in figma-transformer.
• Focused transform verified with php -d memory_limit=1G bin/figma-transformer /Users/chubes/Developer/blocks-engine/figma-transformer/fixtures/🛠️ FSE Pilot Build Theme.fig --frame-id=3468:1038 --zstd-command=/opt/homebrew/bin/zstd --output-dir=<temp>/output.

AI assistance

• AI assistance: Yes
• Tool(s): gpt-5.5 via OpenCode
• Used for: Investigation, implementation, test coverage, and PR description drafting.