fix(SDK-1219): make DataView column justify the single source of truth for alignment

[aaronlee777]

Summary

• DataView column alignment was expressed two ways, but only one reached component adapters: column.justify (baked into cell content via a cellEnd flex wrapper) and an implicit .react-aria-Cell:last-child { text-align: right } rule internal to the default renderer's stylesheet.
• The implicit rule auto-right-aligned whatever landed in the last column, was invisible to custom adapters (they only receive { key, content }), and forced per-table :last-child { text-align: left } overrides to cancel it. It also produced artifacts like a trailing date column rendering right-aligned in a payment summary.
• This PR makes column.justify the single source of truth: numeric columns declare justify: 'end', the implicit CSS is removed, and the injected actions column is end-aligned through the same mechanism.

Changes

• Declare justify: 'end' on currency/amount/hours/tax-rate columns across DataView tables (Payroll, Employee, Contractor, Company). Footers inherit column.justify, so totals rows align automatically. Left rate-as-text columns and single-row horizontal payment summaries left-aligned (right-aligning them reads worse).
• Remove the implicit default .react-aria-Cell:last-child { text-align: right } from the default Table renderer (kept all cosmetic border-radius :last-child rules and the base text-align: left).
• End-align the injected actions/row-menu column in DataTable via the existing withJustify helper, so it stays flush-right without the last-child rule.
• Delete the two obsolete overrides that only existed to cancel the implicit default (EmployeeTable's :not([data-has-menu]) rule + its data-has-menu attr, and OffCycleTaxWithholdingTable's last-child override).
• Tests + story: extend the DataTable column justify tests (an unset last column is not wrapped; the actions column is end-aligned) and add a DataViewWithJustifiedColumns story.

Demo

Reviewable in Storybook via the new UI/Components/DataView → DataViewWithJustifiedColumns story (right-aligned Amount column + footer, flush-right row menu). In the SDK dev app (dev-source routes): JobsList amount, Deductions, PayrollReceipts, and StateTaxes → "Manage tax rates" now right-align numeric columns; text/status/date columns and rate-as-text stay left.

Related

• Jira ticket: SDK-1219
• Consumer-side interim fix (Bootstrap adapter, to be removed once this releases and the dep bumps): Gusto/gws-flows#4052

Testing

• npm run tsc && npm run lint:check && npm run format:check
• npx vitest run src/components/Common/DataView/DataTable/DataTable.test.tsx — includes the extended column justify cases
• Broader: npx vitest run src/components/Payroll src/components/Employee src/components/Company/StateTaxes src/components/Contractor/Payments (touched tables) — all green
• Storybook: npm run storybook → UI/Components/DataView → DataViewWithJustifiedColumns
• Manual regression: confirm actions/row-menu columns stay flush-right and text/status/date last columns are now left-aligned (e.g. ContractorList, EmployeeList)