fix(sync): send held edits before the sync-end refresh reads the database

An edit made while a sync is running is held rather than sent, because the
worker's read-write open blocks on notmuch's exclusive lock. At sync end
onExternalSyncStateChanged() refreshed the list first and flushed the held
edits afterwards, so the refresh read a database that still carried the old
tag, reconciled it into the model, and overwrote the optimistic update the hold
had deliberately left applied. The flush then wrote the tag correctly.

The database ended up right and the list ended up wrong, with nothing scheduled
to re-read it, which is why it looked like the edit had been lost. Reported by
hand: a message read during a sync went back to unread when the sync finished.

The flush moves ahead of the refresh and keeps both properties it already had.
It stays outside the Idle branch, so edits held when /proc/locks becomes
unreadable are not stranded waiting for an Idle that never comes, and it stays
after the status-bar retire, so its own "N held changes sent" message survives.

Both orders leave identical end state, so the first version of the test passed
against the defect: after the handler returns the queue is empty and the write
has been sent whichever ran first. flushGenerationForTesting() stamps the query
generation at flush time, which is what separates them, and the test fails
against the old order with Actual: 3, Expected: 2.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/docs/superpowers/plans/2026-08-03-post-0.1.0-usability.md b/docs/superpowers/plans/2026-08-03-post-0.1.0-usability.md
index 14a242a..4a68f0b 100644
--- a/docs/superpowers/plans/2026-08-03-post-0.1.0-usability.md
+++ b/docs/superpowers/plans/2026-08-03-post-0.1.0-usability.md
@@ -161,6 +161,7 @@ taking that too literally.
 | 95 | A query in the overflow menu cannot be run | defect | XS | **done** 2026-08-15, unreleased. Pre-existing and not caused by 93: the entry's action owned a submenu, and Qt emits no `triggered` for those, so the connection had never fired. Surfaced because 93 moved every query into the menu |
 | 94 | `pinned` has nothing left to decide once the buttons are built-in | maintenance | S | open; **blocked on 93**, and deliberately not part of it. A user-visible removal: the row becomes built-ins only and every saved query lives in the menu |
 | 96 | A query returning the thread already on display opens onto the placeholder | defect | S | **done** 2026-08-15, unreleased. Split from 66's unverified half, which had a different cause. Reproduced from two screenshots after four measured eliminations |
+| 97 | An edit made during a sync is reverted in the list when the sync ends | defect | S | **done** 2026-08-15, unreleased. Found by hand-testing item 89's fix. The sync-end refresh ran BEFORE the held-edit flush, so it read a database that still carried the old tag |
 
 Sizes are rough: XS under an hour, S a sitting, M a session.