Phase 2 (snipe#4): after bulk-reporting sellers to eBay T&S, Snipe now
persists which sellers were reported so cards show a muted "Reported to
eBay" badge and users aren't prompted to re-report the same seller.
- migration 012 adds reported_sellers table (user DB, UNIQUE on seller)
- Store.mark_reported / list_reported methods
- POST /api/reported + GET /api/reported endpoints
- reported store (frontend) with optimistic update + server persistence
- reportSelected wires into store after opening eBay tabs
Phase 3 prep (snipe#4): community blocklist share toggle
- Settings > Community section: "Share blocklist with community" toggle
(visible only to signed-in cloud users, default OFF)
- Persisted as community.blocklist_share user preference
- Backend community signal publish now gated on opt-in preference;
privacy-by-architecture: sharing is explicit, never implicit
