Add replies and emoji reactions to chat messages

Every message has a row under it to reply or react. Replying quotes the
message above the composer, and the sent message stores
reply_to_message_id (a plain id, not a foreign key, so deleting the
quoted message only drops the quote). send-message accepts a quote from
any session of the same conversation, so a rollover or a thread that
moved on still sends; the conversation drops a picked quote when its
session changes. The bot reads the quote as "[Replying to ...]" before
the user's turn, file-only replies included, and relayed messages carry
it too.

Reactions are a fixed set (BotMessageReactions) in
bot_message_reactions, one per message, emoji and user or bot. Users
toggle their own through api/admin/bots/react-message, and every bot
gets react_to_message for the session it answers (the user's latest
message by default). Both push the fresh list as server:bot-reaction,
with mine worked out for the session's user.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/live-relay/relay-new-bot-messages.ts

@@ -1,5 +1,6 @@
 import BunSQLite from "@moduletrace/bun-sqlite";
 import type { BUN_SQLITE_COBBLE_BOT_MESSAGES } from "@/db/types/db";
+import grabMessagesReplies from "@/src/functions/backend/db/bots/grab-messages-replies";
 import { sendToUser } from "@/src/websocket/(functions)/send-to-user";
 
 type Params = {
@@ -9,7 +10,8 @@ type Params = {
 
 /**
  * Pushes `server:bot-message` for every message newer than `after_id` to
- * the sockets on this process of the user whose conversation it's in. Returns the newest id read.
+ * the sockets on this process of the user whose conversation it's in,
+ * with the message a reply quotes. Returns the newest id read.
  */
 export default async function relayNewBotMessages({ after_id, users }: Params) {
     const rows =
@@ -21,9 +23,23 @@ export default async function relayNewBotMessages({ after_id, users }: Params) {
             })
         ).payload || [];
 
+    const replies = await grabMessagesReplies({
+        message_ids: rows
+            .filter((row) => row.reply_to_message_id && users.has(String(row.user_id)))
+            .map((row) => Number(row.id)),
+    });
+
     for (const { user_id, ...message } of rows) {
         if (users.has(String(user_id))) {
-            sendToUser({ user_id, data: { event: "server:bot-message", data: message } });
+            const reply_to = replies.get(Number(message.id));
+
+            sendToUser({
+                user_id,
+                data: {
+                    event: "server:bot-message",
+                    data: reply_to ? { ...message, reply_to } : message,
+                },
+            });
         }
     }