synchronize a bounded, validated 20-item timing ledger with the active Today session
atomically adopt every timed item during cross-device Continue here handoff
migrate legacy single-item sessions and preserve encrypted account-scoped storage
show a privacy-safe item count and total duration on multi-item handoff cards
Verification
RED observed for store persistence, API persistence, ledger claim/adoption, owner publication, multi-item summary, stable clock sampling, and dashboard wiring
focused: 374 passed
full: 2400 passed, 12 skipped
bundle/CI checks: 27 passed
Closes #1276
## What changed
- synchronize a bounded, validated 20-item timing ledger with the active Today session
- atomically adopt every timed item during cross-device Continue here handoff
- migrate legacy single-item sessions and preserve encrypted account-scoped storage
- show a privacy-safe item count and total duration on multi-item handoff cards
## Verification
- RED observed for store persistence, API persistence, ledger claim/adoption, owner publication, multi-item summary, stable clock sampling, and dashboard wiring
- focused: 374 passed
- full: 2400 passed, 12 skipped
- bundle/CI checks: 27 passed
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Closes #1276
What changed
Verification