feat(ui): Model Usage pilot on the shared design system (U5 B2)

[OBenner]

Summary

Fifth and final B2 slice — closes the "Analytics & usage" batch. Reuses the generic AnalyticsDashboard with no new libs/ui component, and exercises all four of its slots (KPIs / charts / barLists / sections) at once.

Electron

• Pure model-usage-ui mappers: shortModelName (strips provider prefix + date suffix so bars read as short model names); buildModelKpis / buildModelCharts / buildModelBarLists / buildModelSections from ModelUsageSummary + ModelUsageTrendPoint, reusing analytics-ui's formatCount/formatCost/shortDate/sampleLabels. 8 tests.
• ModelUsagePilotView over getModelUsageSummary + getModelUsageTrends, mounted as "Model Usage (new UI)" beside the legacy P5 dashboard (export flow stays there).

i18n

• model-usage:modelUsagePilot.* (en+fr), navigation:items.modelUsageNext; adds the Cpu nav icon.

What it renders

• KPIs (with trend sparklines): AI calls, tokens, total cost, distinct models.
• Trend charts: tokens over time, cost over time.
• BarList: "tokens by model" ranked by usage.
• Rail card: input/output token split + provider count.

Verification

• 8/8 mapper tests; libs/ui + Electron tsc clean; i18n parity confirmed (22 keys en+fr); no nested ternaries. No new UI component — AnalyticsDashboard (verified through feat(ui): Analytics dashboard pilot on the shared design system (U5 B2) #439/feat(ui): Merge Analytics pilot on the shared design system (U5 B2) #442, all four slots covered by its stories) renders it.

B2 done

All four B2 screens (Analytics, Productivity, Merge Analytics, Model Usage) now pilot on the shared design system, built on two new primitives (chart set + BarList) and one generic AnalyticsDashboard. That's 10 of 24 sidebar views migrated.

Next

B3 "Extension & infra" (Agent Tools, Plugins, Scheduler, Webhooks, Feedback) — pending your call on whether B5 GitLab is in scope.

🤖 Generated with Claude Code

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Review details

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Configuration used: Path: .coderabbit.yaml

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Run ID: d2d54f71-dbcd-497e-bc26-461e9ab13580

📥 Commits

Reviewing files that changed from the base of the PR and between 1e7c8a7 and 3da9d94.

📒 Files selected for processing (9)

• apps/frontend/src/renderer/App.tsx
• apps/frontend/src/renderer/__tests__/model-usage-ui.test.ts
• apps/frontend/src/renderer/components/ModelUsagePilotView.tsx
• apps/frontend/src/renderer/components/Sidebar.tsx
• apps/frontend/src/renderer/lib/model-usage-ui.ts
• apps/frontend/src/shared/i18n/locales/en/model-usage.json
• apps/frontend/src/shared/i18n/locales/en/navigation.json
• apps/frontend/src/shared/i18n/locales/fr/model-usage.json
• apps/frontend/src/shared/i18n/locales/fr/navigation.json

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch claude/ui-b2-model-usage

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[sonarqubecloud]

Quality Gate failed

Failed conditions
8.5% Duplication on New Code (required ≤ 3%)

See analysis details on SonarQube Cloud