Charts currently expose their values visually (lines, legend, readout row) and via a throttled aria-live summary, but there is no tabular alternative for screen-reader users — noted as a known gap in `docs/accessibility.md`. ## Proposal Provide an accessible data-table view of the quantity and rate series backing the charts, derived from the same trajectory object (never a separate computation). ## Acceptance criteria - [ ] Chart values (species quantities, process rates) are available in an HTML table with proper header cells and units. - [ ] The table is fully keyboard-reachable and operable (toggle/disclosure is a real button; no pointer-only interaction). - [ ] Screen readers can navigate the table and identify series, time, and value for each cell. - [ ] The table stays synchronized with the current time cursor (the row for the current/hovered time is identifiable, e.g. via `aria-current`), and updates when parameters or presets change. - [ ] `npm run check` and the e2e suite pass; a test covers the synchronization requirement.