Added the newly-published EU Policy Brief (EN + DE) to both the "What's
New" section and the "Research Papers" section of the tractatus landing
page, using the clean URL /whitepapers/eu-policy-brief so the card
continues to resolve regardless of HTML extension handling.
- What's New: new featured card positioned between Distributive Equity
whitepaper and the AI Governance series, styled with the blue-cyan
palette to differentiate from the parent paper's indigo-purple
- Research Papers: second-featured entry under Distributive Equity
- Locale keys added to homepage.json for EN, DE, FR, MI
(NL not present as a tractatus locale; DeepL-translated for the
three non-English ones — DE/FR/MI, pending human review)
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