ComparisonChart runs Chart.js with maintainAspectRatio:false, so it sizes
to its container's height — which must be definite. TrendsExplorer gave
.chartBox a min-height, which doesn't resolve the chart wrapper's
height:100%, so Chart.js fell back to its ~150px default: a squashed
8.6:1 sliver that didn't match the mockups. Set a definite height (420px
desktop, 360px mobile where the chips row sits above the canvas).
Verified on staging by patching the live height: canvas went from
1287x150 to 1287x392 (desktop) / 284 (mobile) — proper ~3:1 proportions
matching the mockup, with the England dashed line, COVID/2021-22 gap and
table all reading correctly.
An e2e guard asserts the trends canvas is taller than 220px so the
squash can't regress.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0146VHeLAWjDVE2B5uU67jCB