The TUI still renders the unlisted current model as its own row and marks it
current; Web shows the unset trigger label and asks for a replacement. The
note recorded the Host decision but not that the two surfaces present it
differently, which reads as a missed migration rather than a choice.
Also records why `trigger.selectAria` and `trigger.fallback` hold identical
strings, so a future coalescing cleanup does not merge them.
Yichen Jiang
f12d4f698e