Extend the counter-routing fix beyond markAsRead to every optimistic mailbox
counter update, so a different account's email never adjusts the active
account's folder counters (JMAP ids can collide across accounts).
- Add applyBatchMailboxCounterUpdate() + applyDeleteCounters() and apply the
per-account routing to: deleteEmail (trash + permanent), moveToMailbox,
moveEmailsToMailbox, batchMarkAsRead, batchDelete, and markThreadAsRead.
- markAsSpam/batchMarkAsSpam/batchMoveToMailbox don't touch counters (rely on
refresh) and folder-level ops (rename/empty/markMailboxAsRead) are already
account-scoped — left as-is.
- Test: batchMarkAsRead adjusts each account's counter in its own list.
Stefan Hildebrandt
fa3c57467b