[cristim]

Summary

• Fix PurchaseHistory.monthly_cost TypeScript type from number to number | null in api/types.ts; the API returns null for records that predate the monthly-cost column, and the incorrect non-nullable type caused TypeScript consumers to treat null as 0, displaying "$0" instead of blank
• The renderHistoryList rendering already guarded with != null (correct), so no logic changes were needed
• Add regression test asserting explicit monthly_cost: null renders the muted dash span, not "$0"

Closes #1416

[cristim]

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📥 Commits

Reviewing files that changed from the base of the PR and between 473f69b and 5fbe3b5.

📒 Files selected for processing (2)

• frontend/src/__tests__/history.test.ts
• frontend/src/api/types.ts

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• Commit unit tests in branch fix/1416-monthly-cost-null-blank

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[cristim]

Merged to main after independent review (SHIP) + all CI green. render blank (not $0) for a null Monthly Cost in Purchase History - distinguishes genuine 0 from absent (nullable-not-zero).