feat(code): unify dashboard usage chart with agent chart

[smakosh]

Summary

• Replace the bespoke "Daily spend" bar chart on the DevPass dashboard with the same AgentModelUsageChart used on each coding agent card.
• The chart receives all known coding-agent sources, so it renders the total stacked-by-model usage across agents instead of per-agent.
• The cycle metric cards (Spend / Requests / Tokens / Peak day) and usage bar are untouched.

Test plan

• Open /dashboard with an active DevPlan — the previous "Daily spend" card is replaced by a "Model Usage Overview" card.
• Time-range toggles (1h, 4h, 1d, 7d, 30d) update the chart.
• Metric dropdown (Cost / Requests / Tokens) switches the Y-axis correctly.
• Per-agent charts on the coding agent cards below still work (verifies the renamed ALL_CODING_AGENT_SOURCES export is wired up).
• Empty-state copy renders when there is no recent activity in the selected range.

🤖 Generated with Claude Code

Summary by CodeRabbit

• Dashboard Changes
  • Removed the Daily spend chart visualization from the Usage Overview dashboard to streamline the interface
  • Added a new Agent Model Usage Chart providing detailed insights into coding agent usage, performance patterns, and model allocation

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: d4a6c37b-b203-4275-9a52-287356229706

📥 Commits

Reviewing files that changed from the base of the PR and between 1729a8a and 652df7f.

📒 Files selected for processing (2)

• apps/code/src/app/dashboard/components/CodingAgents.tsx
• apps/code/src/app/dashboard/components/UsageOverview.tsx

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Walkthrough

The PR refactors the dashboard's metrics display by extracting agent sources into a reusable exported constant and replacing the daily spend chart visualization. CodingAgents.tsx now exports ALL_CODING_AGENT_SOURCES and updates the logs query to use it. UsageOverview.tsx removes Recharts dependencies, simplifies data fetching, and replaces the daily cost chart with an agent model usage chart.

Changes

Dashboard Chart Refactoring

Layer / File(s)	Summary
Export agent sources constant apps/code/src/app/dashboard/components/CodingAgents.tsx	Exports ALL_CODING_AGENT_SOURCES derived from AGENTS sources for reuse by other components.
Update logs query with exported constant apps/code/src/app/dashboard/components/CodingAgents.tsx	Updates the /logs query source parameter to use the newly exported ALL_CODING_AGENT_SOURCES instead of the file-local constant.
Refactor imports and data fetch apps/code/src/app/dashboard/components/UsageOverview.tsx	Removes Recharts and chart UI imports, adds AgentModelUsageChart and ALL_CODING_AGENT_SOURCES imports, and simplifies api.useQuery destructuring by removing isLoading.
Replace daily spend chart apps/code/src/app/dashboard/components/UsageOverview.tsx	Removes DailySpendChart implementation and chart configuration block, and adds a stacked AgentModelUsageChart rendering with ALL_CODING_AGENT_SOURCES in the metrics area.

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🎯 2 (Simple) | ⏱️ ~10 minutes

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'feat(code): unify dashboard usage chart with agent chart' accurately describes the main change: replacing the Daily spend chart with AgentModelUsageChart to unify the usage visualization.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/devpass-stacked-model-chart

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