2026-07-04 — v16 keyboard base inspector

July 4, 2026

FU-1 is now implemented for real: every focusable base in the sequence panel can open a keyboard-accessible inspector that reports exact base metadata without touching the existing pointer tooltip behavior.

What shipped

New BaseInspector component with dialog semantics and explicit base metadata fields.
Sequence spans now expose dialog intent/state (aria-haspopup, aria-expanded, aria-describedby).
Inspector open triggers: focus, Enter, and Space on a base span.
Inspector close triggers: Escape and focus leaving the sequence panel.
Inspector values are pulled from the currently displayed trace, so edits/mixed-base/reverse-complement views stay truthful.
Theme-aware inspector tokens and styles added for light/dark parity; hover tooltip remains unchanged.

Verification added

tests/core/baseInspector.test.ts validates exact value formatting and amplitude computation for canonical and ambiguous base calls.
tests/e2e/base-inspector.e2e.test.ts asserts exact position/base/PHRED/peak-amplitude values for a known fixture base, ARIA role/label/linkage, Escape close, focusout close, Enter/Space open behavior, dark-mode operation, and tooltip peak: regression coverage.