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/bots-queue/run-bot-task.ts

@@ -87,7 +87,7 @@ export default async function runBotTask({
         ];
 
         const tools = [
-            ...grabBotTools({ user_id, bot_id: bot.id, workspace_id, computers }),
+            ...grabBotTools({ user_id, bot_id: bot.id, workspace_id, computers, session_id }),
             ...(bot.kind == "coordinator"
                 ? [
                       createWorkspaceTool({ user_id, workspaces: coordinator_workspaces }),