Same cause as the MAC one, and it deserved the same fix rather than another
one-off: on iOS a TextField's title becomes an accessibility label the moment a
prompt exists and nothing is drawn, so "Optional — e.g. Living Room" was the whole
of what the field said about itself.
The prompt is now built per platform. macOS draws the title as a leading label, so
its prompt only hints at the value; iOS has no label to lean on, so the prompt names
the field too. One string for both leaves you either a Mac panel that says
everything twice — which is what the MAC field started doing in the last commit — or
a phone form of unlabelled boxes.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>