[PATCH b4 0/4] review: keep the unread badge alive for applied series

Pressing 'u' on a tracked series fetches the whole thread no matter
its status, but update_series_tracking() refused to refresh
message_count for accepted/thanked/snoozed series. Since the unread
badge is message_count - seen_message_count, new follow-up mail on an
applied series never showed up in the tracking TUI.

The status filter predates folding the count update into the main
update loop, back when each count check cost extra lore round-trips
per series. Today the thread is already in hand, so the filter only
hides mail.

Signed-off-by: Christian Brauner (Amutable) <[email protected]>
---
Christian Brauner (4):
      review: keep refreshing message counts after a series is applied
      review: test the applied-series message-count refresh
      review: drop tests for the batch message-count updater
      review: drop the unused batch message-count updater

 src/b4/review/_review.py          |   9 +-
 src/b4/review/tracking.py         | 209 -------------------
 src/tests/test_review_tracking.py | 417 ++++++++------------------------------
 3 files changed, 86 insertions(+), 549 deletions(-)
---
base-commit: 4217c3e5d3e1eb259626142fd71b91ec6d5e3d1e
change-id: 20260721-work-b4-accepted-unread-badge-acb2b34554eb