v0.48.0

🛠️ Bug fixes

• 🔍 event.search — refactored from O(n) per-event queries to a single LEFT JOIN; actors grouped in JS after one round-trip
• 🪟 Subject detail panel — no longer blocked by loading state; opens immediately on pill click with loading indicator while data fetches
• 🪟 Subject detail panel — demo mode fallback: builds subject + events from local data when no DB is connected
• 📐 Subject detail panel — timeline spine repositioned from mid-dates to right of dates, matching main timeline layout
• 📅 Subject detail panel — years now sorted newest-first, matching main timeline order
• 🖱️ Subject detail panel — mouse wheel scroll now works; Lenis no longer intercepts events inside the panel
• ⚙️ Settings page — Export and About cards now side by side in the bento grid instead of stacked in one column

📚 Documentation

• 📖 CONTRIBUTING.md — added: setup, workflow, code conventions, domain constants, known gaps
• 🛣️ ROADMAP.md — restructured with status key, versioned horizons, and all Settings page placeholders documented as planned items
• 🔑 .env.example — corrected misleading comment on APP_SECRET