bd update --defer doesn't set status=deferred (❄ icon missing)

[Wermeling]

Bug Description

bd update <id> --defer <date> and bd defer <id> --until <date> have inconsistent behavior.

Expected behavior

Both commands should result in the issue showing ❄ (deferred icon) in bd list.

Actual behavior

• bd defer jo4g --until=tomorrow → status=deferred ✅ → ❄ shows correctly
• bd update jo4g --defer=tomorrow → status=open ❌ → ❄ missing; only the status:deferred label and Deferred: date are set

Steps to reproduce

# Using bd update --defer
bd update stock_brawl2-jo4g --defer=tomorrow
bd list | grep jo4g  # Shows ○ (open icon), not ❄

# Using bd defer (correct)
bd defer stock_brawl2-jo4g --until=tomorrow  
bd list | grep jo4g  # Shows ❄ (deferred icon)

Environment

• bd version 1.0.0 (dev)

Additional context

The ❄ icon in bd list appears to be driven by the status field, not the status:deferred label. The --defer flag on bd update sets the label and the Deferred: date metadata, but fails to set status=deferred.

The fix would be for bd update --defer to also set status=deferred to match the behavior of bd defer.