Fix flaky test [chromium] _ e2e/tasks-feed.spec.ts:778:3 _ the /tasks board narrowing inside a wide window _ a ticked-then-unticked box hides when the pointer leaves, and Tab still reveals it

The merge lane saw `[chromium] _ e2e/tasks-feed.spec.ts:778:3 _ the /tasks board narrowing inside a wide window _ a ticked-then-unticked box hides when the pointer leaves, and Tab still reveals it` fail and then pass on a rerun of the same tree. - Test: `[chromium] _ e2e/tasks-feed.spec.ts:778:3 _ the /tasks board narrowing inside a wide window _ a ticked-then-unticked box hides when the pointer leaves, and Tab still reveals it` - Tree: `fdc8d6a0de64c81e3525d7bb940f40fb0e7e1da5` - Lane task: 9958 - Flake record: 01a1745d-f377-7a20-8a25-88b676a8fd50 Make it deterministic; do not delete it unless it tests nothing.

Deflaked tasks-feed.spec.ts:778: hover, reveal check and tick click now retry as one toPass step (a late row shift dropped the hover). Repro 1/30 before, 100/100 green after; quick gate green; PR #6889 queued to the lane. Memory: none applied.