Keep 5h, weekly and context limits in view in the thread #1755

Users on small plans plan their day around the 5-hour and weekly resets. Today the limits are only in the quota dialog. Add an opt-in setting that shows one quiet row per limit window plus Context in the thread: a label, a thin bar and "% left". Hovering a row shows the reset time. At 20% left or less the row turns amber, and at 10% or less it turns red. It reuses the existing provider quota and context data, so there's no new backend work.