fix: Replace unsafe .toFixed() calls with safeFixed() in analytics views
- AnalyticsView: avg_players, uptime_percentage
- WipeAnalyticsView: success_rate, population curve, durations, CSV export
- PlayerRetentionView: retention percentages, session duration, tooltip
- MapAnalyticsView: rotation effectiveness, performance metrics, table
All analytics views now use safe formatter utilities with optional chaining
to prevent null/undefined runtime errors when displaying numeric data.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
26e717ac96