The viral loop, made usable end-to-end:
- Propose sheet (plantare_propose_sheet.dart): from a chat with a peer
(their key already in hand), pick your side, name the seed, choose what
comes back (similar · non-GMO organic / work hours / other) and an
optional return-by, then sign and send. Reached from the chat overflow
menu; confirms "waiting for them to sign".
- Plantares screen: incoming proposals show Accept & sign / Decline right
on the tile; every bilateral row wears a handshake badge — awaiting
signature, signed by both, or declined. Accept falls back to a gentle
"offline" nudge if the proposal isn't in hand yet.
- i18n: full en + es for the bilateral flow; other locales fall back to
base per slang config.
Wire-up only touches human copy (no jargon) and stays behind the
optional PlantareService, so inventory-only builds are unaffected.
Tests: propose sheet drives a real sign+send; the ledger renders the
signed/awaiting badges. Fake SocialSession in your_people test gains the
new transport getter. Widget tests targeted + timed. All green.
