ConfigTimelineLive's chart panel was rendering a bare 'Loading chart...'
placeholder forever — the phx-hook="ConfigTimelineChart" had no JS
implementation registered anywhere, so the whole point of the page
(correlating QoE regressions with config edits) was lost.
Add a focused lazy hook in hooks/config_timeline_chart.ts that:
* Plots Preseem latency / throughput / loss across three Y-axes.
* Overlays vertical dashed markers at each config-change timestamp
with a small badge showing how many lines changed.
* Drops a red triangle on the time axis for every failed check.
* Reuses the Chart.js vendor chunk (esbuild --splitting factors it
into a shared chunk with sensor_chart, so visiting either page
primes the other).
Bundle delta:
chunk-RSDHLN2L.js (Chart.js, shared) 314.8 KB
config_timeline_chart 7.2 KB
sensor_chart (was 325 KB standalone) 10.6 KB after dedup
