#210: Add role="img" aria-label to 9 Chart.js canvases in node-analytics.js
and observer-detail.js with descriptive labels.
#211: Add scope="col" to all <th> elements across analytics.js, audio-lab.js,
compare.js, node-analytics.js, nodes.js, observer-detail.js, observers.js,
and packets.js (40+ headers).
#212: Add aria-label to packet filter input and time window select in
packets.js. Add for/id associations to all customize.js inputs: branding,
theme colors, node/type colors, heatmap sliders, onboarding fields, and
export controls.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
f04f1b8e77
