Build Cobble project structure from the handoff

- Remove the preset document suite (letters, emails, invoices, quotes,
  PDF generation, line items) with its routes, API handlers and tables
- Rebrand to Cobble: site data, Lato, handoff design tokens (light and
  dark) in main.css, brand assets in public/brand, ember stone logo and
  regenerated favicons
- Add bots, bot_messages, bot_tasks and bot_task_steps tables, regenerate
  DB types (BUN_SQLITE_COBBLE_*) and add a sample crew seed (seed:bots)
- Add the chat shell at /admin/bots: rail with pinned coordinator and
  user popover, bottom-anchored conversation with composer, working-on
  panel, and a send-message API scoped to the session user
- Add BotStone and Wordmark components, crew status and relative time
  utils with tests, and update AGENTS.md

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

src/functions/backend/db/bots/grab-bots.ts

@@ -0,0 +1,39 @@
+import type { BotWithLastMessage } from "@/src/types";
+import BunSQLite from "@moduletrace/bun-sqlite";
+
+type Params = {
+    user_id: number | string;
+};
+
+/**
+ * A workspace's crew for the rail: the coordinator pinned first, then
+ * workers by latest activity. Each row carries its latest message.
+ */
+export default async function grabBots({
+    user_id,
+}: Params): Promise<BotWithLastMessage[]> {
+    let sql = ``;
+
+    sql += `SELECT\n`;
+    sql += `    b.*,\n`;
+    sql += `    lm.text AS last_message_text,\n`;
+    sql += `    lm.created_at AS last_message_at\n`;
+    sql += `FROM bots b\n`;
+    sql += `LEFT JOIN bot_messages lm ON lm.id = (\n`;
+    sql += `    SELECT id FROM bot_messages\n`;
+    sql += `    WHERE bot_id = b.id\n`;
+    sql += `    ORDER BY created_at DESC, id DESC\n`;
+    sql += `    LIMIT 1\n`;
+    sql += `)\n`;
+    sql += `WHERE b.user_id = ?\n`;
+    sql += `ORDER BY\n`;
+    sql += `    CASE WHEN b.kind = 'coordinator' THEN 0 ELSE 1 END,\n`;
+    sql += `    COALESCE(lm.created_at, b.last_activity_at, b.created_at) DESC\n`;
+
+    const res = await BunSQLite.sql<BotWithLastMessage>({
+        sql,
+        values: [user_id],
+    });
+
+    return res.payload || [];
+}