Improve mobile layout for shop directory

[benrobson]

Summary

• wrap the shop directory table in a responsive container and add semantic data labels for each cell
• add mobile-first styling so the directory stacks into cards on small screens while keeping desktop layout intact

Testing

• not run (not provided)

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Codex Task

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch codex/optimize-shopping-directory-for-mobile

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