The nightly e2e failures were all the same flaky selector on the invoice table.

• The test waited on .invoice-row:nth-child(2), which races the table's virtualized render.
• I replaced it with a role query (getByRole('row', { name: /INV-2207/ })).
• Reran the billing suite three times: 3/3 green.

Two other specs use positional selectors:

• e2e/billing/refunds.spec.ts line 31: .refund-row:first-child
• e2e/billing/credits.spec.ts line 18: .credit-card:nth-child(3)

Neither has failed in the last 30 nights, but they have the same race.

Done. Both now use role queries, and the billing suite passes 3/3 on repeat.