Three new sync-tracked Dexie tables under the articles appId:
articleImportJobs — job header (counters, status, lease metadata).
articleImportItems — one row per URL in a job, state-machine driven.
articleExtractPickup — short-lived server→client handoff inbox.
URL stays plaintext on items by necessity — the server-worker reads it
without master-key access, same rationale as articles.originalUrl. The
extracted article eventually lands encrypted in the existing `articles`
table; bulk-import rows hold only pointers.
Plan: docs/plans/articles-bulk-import.md (full architecture, 7 phases,
test matrix, edge-cases). Phase 2 already shipped in 5535f2da4 (worker);
this commit lays the schema underneath it.
Originally committed as b2f4e8314, lost during a parallel reset, here
restored via cherry-pick.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
