Implement the Largest-Triangle-Three-Buckets (LTTB) algorithm to downsample
metrics data for large time intervals (30 days generates 260K-500K+ points).
Reduces rendered points to ~1000 while preserving visual accuracy of peaks
and valleys. Fixes unresponsive page when selecting 30-day metrics interval.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
