Delete uses findOneAndDelete with author match (no TOCTOU window);
existence check only runs on miss to distinguish 403 vs 404. Posts
list capped at 200. Drop unused resolveTagChannel and refreshParams;
route slack URL building through the composable's slackUrl helper.
Replace window.confirm with an inline Delete? / Cancel / Confirm flow on
post cards. Add focus-visible outlines, initials in avatar placeholders,
and promote post/form titles from h3 to h2 for heading order.
