browser.spec.ts (2360), trendChart.spec.ts (1629), contextView.spec.ts (1504), and
overview.spec.ts (1065) exceeded the 1000-line limit. Each splits along its existing
describe seams into same-directory siblings, with the fixtures that more than one
sibling needs extracted once into a shared harness.
The move is verbatim: test titles, describe blocks, and every assertion line are
preserved exactly (2061 tests before and after, no duplicate titles, no skips), and
the suite reports the same coverage.
