Task Checkbox Retained After Deselect
Fix the bug with the following reproduction steps:
1. Select a task and then deselect it
2. Move the mouse elsewhere
Expected behavior: the checkbox disappears
Actual behavior: the checkbox is retained on the screen

Outcome
Feed row tick now reveals on keyboard focus only (:focus-visible), so click focus no longer pins it after deselect. New e2e red→green, quick gate green, visual check OK. PR #6196 queued to the merge lane.
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