Insights, rich dashboard, admin analytics

What's new

Insights (Stage 1-4)

• Cross-orbit weekly digest on /app/insights: AI-generated week recap from pre-computed facts (sleep avg, tasks completed, mood distribution, finance summary).
• 4 stages: facts engine → narrative → predictive nudges → memory facts auto-extract.
• On top — JS correlations (Pearson, mean comparison) — pure stats, no AI.

Dashboard (Stages 0-3)

• Time-aware greeting by name, AI suggestions from memory facts, Today hero with events/tasks/habits/health, sparklines on overview cards (7-day daily counts), AI Chat shortcut.
• Daily roundup card — time-aware (evening or activity).

Admin (Stage A+B)

• Analytics sections: signups time-series, DAU/WAU/MAU, top AI users, conversion funnel.
• Confirm dialogs for destructive actions.

Fixed

• Mood chips in insights used wrong i18n namespace.
• Orbit badges in sidebar showed raw EN keys (JOURNAL/FINANCE) — added ORBIT_I18N_KEYS map.
• Tags page right panel empty — fixed with sticky positioning.
• Habits heatmap invisible on light theme — replaced hardcoded rgba with theme-aware var.