AU-011: Show backfill progress UI¶

Track: 1 — MVP
Section: 1.24 Historical Backfill
Status: [ ] Todo
Repo: app-user
Branch: feature/AU-011-backfill-progress-ui

Done When¶

Progress bar: "Syncing 15 days of history... 45%". Updates as each day's data transfers. Completion toast: "History sync complete"

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