'Seeds changed hands' is now the single entry point on the variety
detail (and per lot row): direction (gave/received), one-tap 'all of it'
(default — the whole-plant/shrub case), optional partial quantity,
counterparty, and reveal-on-tap money and return-promise sections that
spawn the Sale/Plantare rows through recordHandover in one save.
Zero-lot varieties still work (ledger rows only); several lots get a
chip picker. The Sales/Plantares screens keep their own add buttons for
off-app records — the sheets stay, demoted to secondary.
i18n handover block in en/es/pt/ast; widget tests for the flow.
