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-user-bot.ts

@@ -0,0 +1,22 @@
+import type { BUN_SQLITE_COBBLE_BOTS } from "@/db/types/db";
+import BunSQLite from "@moduletrace/bun-sqlite";
+
+type Params = {
+    bot_id: number | string;
+    user_id: number | string;
+};
+
+/**
+ * A bot only if it belongs to the given workspace owner.
+ */
+export default async function grabUserBot({
+    bot_id,
+    user_id,
+}: Params): Promise<BUN_SQLITE_COBBLE_BOTS | null> {
+    const res = await BunSQLite.sql<BUN_SQLITE_COBBLE_BOTS>({
+        sql: `SELECT * FROM bots WHERE id = ? AND user_id = ? LIMIT 1`,
+        values: [bot_id, user_id],
+    });
+
+    return res.payload?.[0] || null;
+}