- channels CB3: sort discovery rows NULLs-last (title is None) to match the DB
ORDER BY exactly — coercing NULL title to "" floated untitled channels to the top.
- AdminUsers SC1: track in-flight rows in a Set, not a single id — per-row disabling
now lets the admin start concurrent row actions, and a shared id was cleared by
whichever settled first (re-enabling a still-pending row → possible double-submit).
- ChatThread CT4: reset the incoming-count ref when partnerId changes — the Messages
page reuses one ChatThread across conversation switches, so a same-count switch
could skip the open-marks-read badge refresh.
- messages MB3: push a bare {type:"unread"} (drop the now-dead count query — the
client re-fetches on the signal and ignored the number anyway).
- api.ts: extract the shared keepalive `beacon()` helper (saveProgressBeacon +
plexProgressBeacon were near-verbatim copies).
3394dabbeb