v3: the chat stops dropping things and holds up to long messages — a message sent while the socket was down vanished with the draft already cleared, and a rejected one fared no better since the client ignored any error that wasn't about a vote or a like. Sends now carry a nonce and sit dimmed in the list until their echo retires them; the server's refusal, an offline socket or ten seconds of silence turns one into a failed row with retry, edit and discard, and a failed row that turns up in the history after a reconnect is retired as having landed after all. Failed edits and deletes show in a bar above the composer. The live stream only goes to signed-in sockets, matching the history behind auth; sends, edits and deletes share a per-user token bucket (typing and read markers get their own, and are just dropped past it); and moderation re-reads the role from the database on every check rather than trusting the one a week-old socket captured. Unread now lives on the server as users.chat_read_at (migration 0014, existing users start caught up), so the count survives a reload and every tab and device clears together; opening onto unread history lands on a "new" divider rather than the bottom, and marks it read only once you've scrolled down to it. After a reconnect the chat re-reads everything from its oldest loaded message and takes that as the truth, edits and deletions included, or reloads the latest page if too much happened. History pages on (created_at, id) so a shared millisecond can't hide a message at a boundary. In the modal: a run of messages from one author shares a header with the time in the gutter on hover, mentions and replies to you get an accent edge, a pill counts what arrived while you were scrolled up, the draft survives closing and reloading, relative times tick, reply previews are flattened from markdown, owners can delete their own messages, ↑ in an empty composer edits your last one, and there's a proper loading and retry state instead of a flash of "No messages yet". Long messages: the composer and edit box grow only so far and then scroll, instead of squeezing the list away; the counter shows only near the limit and sits above the box, since .comment-reply-textarea's padding shorthand had quietly cancelled the room kept for it inside; TextEditor sizes itself before paint, so opening an edit animates to the right height instead of dipping and snapping; and the list follows the bottom through any change in its content's height while pinned there, so ending an edit returns you to the end. A mention notification opens the chat over the page you're on rather than the home page.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/utils/chatText.ts

@@ -0,0 +1,34 @@
+// Text helpers for the live chat.
+
+// Mirrors MENTION_RE in api/services/notification-service.ts.
+const MENTION_RE = /(?<![[(\w])@(\w+)/g;
+
+/** Whether `body` @-mentions `username` (case-insensitively), by the same rule
+ * the server uses to send mention notifications. */
+export function mentionsUser(body: string, username: string): boolean {
+  const target = username.toLowerCase();
+  for (const m of body.matchAll(MENTION_RE)) {
+    if (m[1].toLowerCase() === target) return true;
+  }
+  return false;
+}
+
+/**
+ * Flattens chat markdown to one line of plain text, for the reply previews:
+ * images become a label, links their text, and markup characters go. Also
+ * copes with a body the server cut short mid-link, which would otherwise show
+ * a dangling half-URL.
+ */
+export function markdownToPlainText(md: string, imageLabel: string): string {
+  return md
+    // A truncated image or link at the very end: drop the unfinished target.
+    .replace(/!\[([^\]]*)\]\([^)]*$/, (_, alt: string) => alt || imageLabel)
+    .replace(/(^|[^!])\[([^\]]*)\]\([^)]*$/, "$1$2")
+    .replace(/!\[[^\]]*$/, "")
+    .replace(/!\[([^\]]*)\]\([^)]*\)/g, (_, alt: string) => alt || imageLabel)
+    .replace(/\[([^\]]*)\]\([^)]*\)/g, "$1")
+    .replace(/^\s{0,3}(#{1,6}|>|[-*+]|\d+\.)\s+/gm, "")
+    .replace(/```\w*|\*\*|__|~~|[*`]/g, "")
+    .replace(/\s+/g, " ")
+    .trim();
+}