[cristim]

Summary

• Add .usage-sparkline-cell CSS rule (center-align, min-width: 4rem) and .usage-sparkline CSS rule (display: block, color: var(--cudly-primary)) to charts.css; the missing rules meant the SVG's stroke="currentColor" could inherit a color that was invisible or the SVG would be misaligned in the table cell
• The SVG generation in renderUsageSparkline() was already correct; only the stylesheet was missing
• Add integration tests verifying the SVG polyline renders in the table when a recommendation carries non-empty usage_history, and the em-dash fallback is used when usage_history is null

Closes #1417

[cristim]

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Review details

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 1847170c-0818-4b48-95dd-0c2a02fc98a8

📥 Commits

Reviewing files that changed from the base of the PR and between 473f69b and 1023390.

📒 Files selected for processing (2)

• frontend/src/__tests__/recommendations.test.ts
• frontend/src/styles/charts.css

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/1417-opportunities-sparkline

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[cristim]

Merged to main after independent review (SHIP) + all CI green. restore the Opportunities per-row usage sparkline (CSS currentColor resolution + cell sizing).