style: redesign bp vs buckler timeline with dark theme

[unclehowell]

Summary

• restyle the BP vs Buckler page with a dark theme header, legend, and responsive layout that introduces bubble timeline markers
• replace the static event cards with focus-activated detail panels, lazy reveal logic, and updated evidence/modal styling for faster browsing
• refresh key theme and research cards to match the new palette while preserving data-driven rendering

Testing

• python -m json.tool static/bpvsbuckler/data/timeline.json > /tmp/validate.json

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https://chatgpt.com/codex/tasks/task_e_68d038ca2b8483208a0d269ff7093e95

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