feat: lead-back guarantee — one-click credit refund after 3 days no response
Backend:
- Migration 0020: add guarantee_claimed_at, guarantee_contact_method to lead_forwards
- credits.py: refund_lead_guarantee() — validates 3–30 day window, reverses credit
spend via ledger entry (event_type='guarantee_refund'), sets status='no_response'
- GuaranteeAlreadyClaimed, GuaranteeWindowClosed exceptions
- Route: POST /suppliers/leads/<forward_id>/guarantee-claim — HTMX endpoint,
returns updated lead card partial with success message
- _get_lead_feed_data: pull forward_id, forward_created_at, guarantee_claimed_at
so dashboard feed can show/hide the guarantee button per-lead
UI:
- lead_card_unlocked.html: "Lead didn't respond" button rendered client-side via
JS (3–30 day window check in browser), shows contact method radio + submit
- Success state and already-claimed state handled in partial
EN/DE: remove empty sup_credits_only_post key (fails i18n parity test)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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