Reopening a USDT-only request shows an orange preparing summary for about 10 s #1504

Reopening a USDT-only payment request on the payer side first shows a "preparing" Payment Request summary for about 10 s. During that time Swipe To Pay and the From/For icons are orange (the Bitcoin accent) instead of the USDT teal, and then the screen settles into the correct state.

Found during the device gate of #1494 (J2 step 10, journeys/paykit-quoted-usdt.xml). Not introduced by that PR.

Steps

1. On device A, create a USDT-only payment request for a contact (for example 150.50 USD).
2. On device B (the payer), open the request, then go Back.
3. Reopen the request.

Expected: the summary opens in its USDT state, or a neutral loading state that doesn't use the Bitcoin accent.

Actual: for about 10 s it shows a preparing summary with an orange swipe and orange From/For icons, then switches to the USDT styling.