Taker reputation is received but never shown

[Catrya]

The daemon sends the maker an extra DM with the taker's
reputation: a Peer payload with an empty pubkey and
reputation: Some(UserInfo { rating, reviews, operating_days }), riding the
same PayInvoice / AddInvoice action as the flow message
(notify_taker_reputation() in mostrod's src/util.rs).

The app parses it — it shows up in the logs — but nothing surfaces it in the
UI, so the maker never sees who took their order:

gift-wrap: action=PayInvoice order_id=Some(9e60e970-…) trade_pubkey=bfff4ce5
payload=Peer(Peer { pubkey: "", reputation: Some(UserInfo { rating: 4.375, reviews: 4, operating_days: 64 }) })

The order book already renders the maker's reputation from the kind 38383
rating tag, so this is the missing counterpart side.

Expected: show it where the maker decides whether to continue — the
pay/add invoice screen and the trade detail — deriving the counterpart's role
from the user's own (paying the hold invoice ⇒ the taker is the buyer; adding
an invoice ⇒ the taker is the seller).

Note: a brand-new user and a full-privacy taker both arrive as zeros, so
they are indistinguishable on the wire.