Task page Details: polish found while checking

Found on /tasks/:id Details (desktop 1440px, dev stack) while verifying Task 6726: 1. The "Unverified done" warning shows two warning icons (the Alert's own icon plus a "⚠" glyph in the text); keep one. 2. Created/Updated timestamps wrap "2:14:01 / PM" onto two lines in the side-panel field grid; keep a timestamp on one line (nowrap or a shorter format). 3. The Runner field's "Sessions" link is a small caption link far from the label; align its size with the other Details links (e.g. "Verify a manifest"). Out of scope: the Tasks board list, task states and transitions, API changes. Done means: each item visible on /tasks/:id on a dev stack with a screenshot per item; `./dc check full` green.

Fixed all 3 Details items: one warning icon, Created/Updated on one line (short date+minute), Sessions link at body2. Visually checked at 1440/1280px. PR #5671 merged. Full gate red on 3 tests outside this diff, filed as draft #6813; deploy superseded.