Fix dashboard header overlap at narrow desktop widths

[erichroepke]

Summary

• allow the dashboard header stats and controls to wrap cleanly
• make host telemetry compact below 1100px by hiding sparklines and shrinking the disk bar
• keep the fix scoped to dashboard/header layout

Root cause

The compact dashboard header forced the status/telemetry row and controls into one horizontal line. At narrow desktop widths, fixed-width telemetry elements competed with the filter/view controls and caused crowding/overlap.

Validation

• npm run check:tokens
• npm run build

Note: Docker was unavailable in this session, so the final production build was run locally after installing frontend dependencies from the lockfile.

[erichroepke]

Superseded by #1756, rebuilt from current dev and expanded to cover the complete narrow-viewport Dashboard regression tracked in #1754. Retargeting this older main-based draft would expose an unrelated 27-file diff, so I am closing it in favor of the clean replacement.