Respect linked CSS flex layout for card groups

[chubes4]

Summary

• Use merged source presentation CSS when inferring WordPress group layout attributes.
• Treat plural card wrapper classes as high-value styled elements so linked CSS can override broad class-name grid heuristics.
• Add parity fixture coverage for a services-cards wrapper whose linked CSS declares display:flex.

Root cause

Figma/static HTML can use class names like *-cards for flex rows. The PHP transformer previously inferred WordPress layout.type=grid from the class name before considering linked stylesheet declarations, which can make imported WordPress blocks collapse/overlap even when source CSS uses flex.

Testing

• php tests/parity/run.php
• php tests/contract/run.php
• Verified the Fisiostetic fixture's affected servicr-cards wrappers serialize with source flex styles instead of WordPress grid layout.

AI assistance

• AI assistance: Yes
• Tool(s): openai/gpt-5.5 via OpenCode
• Used for: Investigation, patch drafting, regression fixture, and local verification.