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/live-relay/relay-new-job-updates.ts

@@ -0,0 +1,33 @@
+import BunSQLite from "@moduletrace/bun-sqlite";
+import type { BotJobUpdateData } from "@/src/types";
+import { sendToUser } from "@/src/websocket/(functions)/send-to-user";
+
+type Params = {
+    after_id: number;
+    users: Set<string>;
+};
+
+/**
+ * Pushes `server:bot-job-update` for every job step newer than `after_id`
+ * to its owner's sockets on this process. Returns the newest id read.
+ */
+export default async function relayNewJobUpdates({ after_id, users }: Params) {
+    const rows =
+        (
+            await BunSQLite.sql<BotJobUpdateData & { user_id: number }>({
+                sql: `SELECT u.*, q.task_id, b.user_id FROM bots_queue_updates u
+                    JOIN bots_queue q ON q.id = u.bots_queue_id
+                    JOIN bots b ON b.id = u.bot_id
+                    WHERE u.id > ? ORDER BY u.id ASC LIMIT 500`,
+                values: [after_id],
+            })
+        ).payload || [];
+
+    for (const { user_id, ...update } of rows) {
+        if (users.has(String(user_id))) {
+            sendToUser({ user_id, data: { event: "server:bot-job-update", data: update } });
+        }
+    }
+
+    return Number(rows[rows.length - 1]?.id) || after_id;
+}