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## Summary Addresses user feedback on #600 — two improvements to RF Health detail panel charts: ### 1. Auto-scale airtime Y-axis Previously fixed 0-100% which made low-activity nodes unreadable (e.g. 0.1% TX barely visible). Now auto-scales to the actual data range with 20% headroom (minimum 1%), matching how the noise floor chart already works. ### 2. Hover tooltips on all chart data points Invisible SVG `<circle>` elements with native `<title>` tooltips on every data point across all 4 charts: - **Noise floor**: `NF: -112.3 dBm` + UTC timestamp - **Airtime**: `TX: 2.1%` or `RX: 8.3%` + UTC timestamp - **Error rate**: `Err: 0.05%` + UTC timestamp - **Battery**: `Batt: 3.85V` + UTC timestamp Uses native browser SVG tooltips — zero dependencies, accessible, no JS event handlers. ### Design rationale (Tufte) - Auto-scaling increases data-ink ratio by eliminating wasted vertical space - Tooltips provide detail-on-demand without cluttering the chart with labels on every point ### Spec update Added M2 feedback improvements section to `docs/specs/rf-health-dashboard.md`. --------- Co-authored-by: you <you@example.com>