The Dashboard page was rendering as plaintext because all .dash-* CSS
classes (dash-section, dash-onair-*, dash-jobs-*, dash-cluster-*,
dash-statusbar, etc.) were missing. Added them with the full dark-theme
design-system styling matching the rest of the app.
The Cluster page's .stat-row and .stat-card classes were also missing,
causing node statistics (counts, CPU, GPUs, memory) to render unstyled.
Added grid-based stat row and card styles.
ZGaetano
48d54a32cf