Replaces the cards-with-halo SkeletonCard fallback (which produced a
washed-out, hard-to-read placeholder) with a single canonical empty
state used everywhere in the app.
What's new:
- EmptyStateIllustration.tsx — custom inline SVG: two stacked monitor
cards (front blue, back gray, both with hairline strokes and a soft
fade toward the bottom), set against a faint grid of solid + dashed
background lines. Uses only lightened palette tokens (#7DA8E8 blue,
#B6C2CF gray, #CBD5E1 grid).
- EmptyState.tsx — the layout: illustration + title + description +
optional CTA + optional secondary link + optional inline alert slot.
Supports a compact horizontal variant for in-panel use.
Migrations:
- Fallback.tsx: BaseFallback / EmptyFallback / EmptyMonitorFallback /
ErrorFallback now delegate to EmptyState. Public APIs unchanged so
every existing consumer (BasePageWithStates, MonitorBasePageWithStates,
Pages/Uptime, Pages/Notifications, Pages/Infrastructure, etc.) keeps
working without edits.
- BasePage.tsx: PageSpeedKeyPriorityFallback rebuilt on top of EmptyState
with the warning slot. Fixes the previous reports of "white cloudy
area" + half-faded text — message and link now render in consistent
dark text with green Settings link.
No prop changes for any page-level consumer. The illustration is a
single SVG with no external assets.