Add computer switching, crew reporting, job steps and markdown chat

- Bots have a current computer (bots.computer_id), switched from the chat
  header beside the model button or by clicking a computer the bot names
  ([computer:ID]); tasks run on it by default
- search_computers runs one read-only command on all of a bot's computers;
  chat replies know their computers (compose-computers-note)
- The coordinator can use every computer and grants or revokes crew access
  with assign_computer
- Delegated jobs record requested_by_bot_id; the worker's result or failure
  is reported back in the coordinator's conversation
- bots_queue_updates records each model turn of a job, pushed live and shown
  in the working-on panel
- Live relay: every process pushes new messages, job steps and bot changes
  from the database to its own sockets, so work done elsewhere shows live
- Bot messages render as markdown (react-markdown + remark-gfm, no raw HTML)
  with twui components; rail previews are plain text
- Fix header button overflow in the model and computer selects
- Bump @moduletrace/twui to 0.1.2

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

src/layouts/bots/(partials)/bot-row.tsx

@@ -6,6 +6,7 @@ import { twMerge } from "tailwind-merge";
 import BotStone from "@/src/components/general/bot-stone";
 import type { BotWithLastMessage } from "@/src/types";
 import type { BotFace, BotHue } from "@/src/dict/bot-dict";
+import messagePreview from "@/src/utils/message-preview";
 import relativeTime from "@/src/utils/relative-time";
 import UnreadDot from "./unread-dot";
 
@@ -24,7 +25,11 @@ type Props = {
  */
 export default function BotRow({ bot, selected, subtitle }: Props) {
     const hue = (bot.hue || null) as BotHue | null;
-    const snippet = subtitle ?? bot.last_message_text ?? bot.role ?? "";
+    const snippet =
+        subtitle ??
+        (bot.last_message_text ? messagePreview({ text: bot.last_message_text }) : null) ??
+        bot.role ??
+        "";
     const at = bot.last_message_at || bot.last_activity_at;
 
     return (