fix: type dashboard chart metric keys

[KMKoushik]

Summary

• tighten metric key typing in dashboard email chart to keep visibleMetrics as StackKey[]
• avoid implicit string indexing in tooltip/chart metric access by preserving literal key types
• keep behavior unchanged while fixing the TypeScript compile error

Verification

• pnpm --filter web build

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Summary by cubic

Fix TypeScript types in the dashboard email chart to preserve literal metric keys and keep visibleMetrics typed as StackKey[], avoiding implicit string indexing. No behavior change; resolves the compile error in the web build.

^{Written for commit c8be974. Summary will update on new commits.}

Summary by CodeRabbit

• Refactor
  • Optimized internal type handling and data initialization in the email chart component for improved code maintainability.

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Project	Deployment	Actions	Updated (UTC)
unsend-marketing	Ready	Preview, Comment	Mar 15, 2026 1:07pm

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[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 5c86b6a2-c1ff-403c-b07e-88b57df22279

📥 Commits

Reviewing files that changed from the base of the PR and between 4307670 and c8be974.

📒 Files selected for processing (1)

• apps/web/src/app/(dashboard)/dashboard/email-chart.tsx

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Walkthrough

The component was refactored with typing and array handling improvements. The STACK_ORDER constant was changed from explicit string[] annotation to type inference with as const. The visibleMetrics variable received an explicit StackKey[] type annotation. Additionally, when no metrics are selected, visibleMetrics initialization was modified to return a shallow copy of STACK_ORDER instead of referencing the original array.

📝 Coding Plan

• Generate coding plan for human review comments

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