fix: add aria-sort semantics and live announcements to transactions sort (Closes #731)

[waterWang]

Description

Fixes #731 — Add aria-sort semantics and screen-reader sort announcements to components/transactions/sort.tsx.

Changes

sort.tsx (SortControl)

• Added a visually-hidden aria-live="polite" region that announces the current sort order to screen readers when the user changes it
• Improved the trigger button's aria-label to include the active sort description (e.g., "Sort transactions. Sorted by Date descending, then by Amount ascending.")
• Added renderSortDescription() helper to build human-readable descriptions from sort configs

transactions-table.tsx

• Added sortConfigs prop to TransactionsTablePropsExtended
• Added getAriaSort() helper to map sort configs to aria-sort values
• Set aria-sort="ascending" / "descending" / "none" on the Date, Amount, and Status column headers
• Fixed pre-existing JSX parse error: TableHead function was returning two adjacent elements (<th>...</th> followed by a <>...</> fragment) without a wrapper — added proper closing ); and return ( to separate the helper function from the component's render

transactions-content.tsx

• Pass sortConfigs to TransactionsTable component

Testing

• sort.test.tsx — 15 tests passing (added 4 new tests for aria-live region, aria-label with sort info, multi-column announcement, and empty sort announcement)
• transactions-table.test.tsx — Added 4 new tests for aria-sort behavior on column headers

WCAG 2.1 AA Compliance

• ✅ aria-sort on sortable column headers (Date, Amount, Status)
• ✅ aria-live="polite" announcements for sort changes
• ✅ aria-atomic="true" ensures the full announcement is read
• ✅ role="status" on the live region for correct screen reader behavior
• ✅ Trigger button has descriptive aria-label including current sort state
• ✅ Dropdown menu items operable with Enter and Space (inherited from Radix UI DropdownMenu)

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