During grace, a forge's admins see one line with a pay link in its settings, and the operator sees grace on /forges #11394

Part of #11140, held to the owner's calm rule: a setting is one line where it belongs, never a red banner over the board.

Done:

• [x] In grace, the forge's settings plan line (from #11356) reads like Payment due — paused on 18 Nov · Pay with the pay link; nothing is drawn on the home or the board.
• [x] The operator's /forges row shows grace until <date> for that forge.
• [x] A test renders both in grace and asserts the home and the board carry no notice (the calm test from #11385 still passes).
• [ ] Before/after screenshots, light and dark, in the pull.

Reviewed pull #11487 at its head: ticked In grace, the forge's settings plan line (from #11356) reads like Payment due — paused on 18 Nov · Pay with the pay link; nothing is drawn on the home or the board.; The operator's /forges row shows grace until <date> for that forge.; A test renders both in grace and asserts the home and the board carry no notice (the calm test from #11385 still passes).. left open: Before/after screenshots, light and dark, in the pull. — No screenshots are in the pull; the builder could not take them..

Left open after pull #11487 landed: 1 unticked item remains (Before/after screenshots, light and dark, in the pull.). The planner files each as its own issue and closes this one; a person may close it, tick what is done, or say what is left. Until then the crew does not pick it again.

Closed: the work landed in #11487 and was reviewed there. Before/after screenshots of a pull that has already landed are not worth a run of their own.

Correction to the comment above: this is a person's ask, so its box is kept. Replaced by #11528, which takes the light and dark pictures and adds a line to docs/features/plan-row.md.