feat(dashboards): add empty-state graphic for the dashboard page

[TheodoreSpeaks]

Summary

• Added a drawn empty-state graphic for the dashboard page — a stat tile, a donut tile, and a trend panel fading off the corner — matching the tables/files/knowledge/logs set (same hairline, ink mixes, and corner fade)
• DashboardEmptyState lives with the other resource empty states and replaces the bare EmptyState in dashboard-resource.tsx; copy unchanged

Type of Change

• New feature

Testing

• Rendered the real component in light and dark next to the existing empty states
• bun run lint, check:audits (58/58), block-registry check, docs-manifest:check
• components/dashboards tests pass; root bun run test shows unrelated local failures only (env-dependent rate-limit/timeout tests and load timeouts) — type-check left to CI

Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• Tests added/updated and passing (new tests pass the test-audit authoring gate)
• No new warnings introduced
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

🤖 Generated with Claude Code

https://claude.ai/code/session_01J7A6CWpREr1jiPAdWyTQbA

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1 Skipped Deployment

Project	Deployment	Actions	Updated
docs	Skipped		Oct 7, 2026 5:35pm UTC

[cubic-dev-ai]

No issues found across 3 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

_{Turn on auto-fix | Re-trigger cubic}

[greptile-apps]

Confidence Score: 5/5

[Low risk] Adds a custom empty-state graphic for dashboards.

The PR appears safe to merge; no blocking issue remains.

Summary

Adds a dashboard empty-state drawing with a stat tile, donut chart, and trend panel. The existing copy stays unchanged.

• Changes since the previous review make SPARKLINE and TREND readonly and update toPath to accept them. Their coordinates and drawing output stay unchanged.
• The previous mutable-array finding is fixed.
• TheodoreSpeaks dismissed the props-interface finding: both components take no props, match sibling components, and empty interfaces would add nothing.
• No new actionable issues were found.

_{Reviews (2) · Last reviewed commit: "improvement(dashboards): mark empty-stat..." · Reviewed by Greptile}

[TheodoreSpeaks]

@greptile

[TheodoreSpeaks]

@cubic-dev-ai review this PR

[cubic-dev-ai]

@cubic-dev-ai review this PR

@TheodoreSpeaks I have started the AI code review. It will take a few minutes to complete.

[cubic-dev-ai]

No issues found across 3 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

_{Turn on auto-fix | Re-trigger cubic}