Closes #481
## What changed
- split unfinished drafts from queued deliveries in a mobile-safe Delivery Center
- show Waiting, Sending, and Needs attention totals with bounded last-attempt context
- add one safe Retry waiting action that retains account and uncertain-delivery protections
- persist observable foreground delivery state for both issue and authored outboxes
## Verification
- `pytest -q tests/test_drafts.py tests/test_issue_outbox.py tests/test_authored_outbox.py`
- `pytest -q` (962 passed)
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Closes #481
What changed
Verification
pytest -q tests/test_drafts.py tests/test_issue_outbox.py tests/test_authored_outbox.pypytest -q(962 passed)