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/components/general/logo-icon.tsx

@@ -1,35 +1,22 @@
 import type { ComponentProps } from "react";
-import { twMerge } from "tailwind-merge";
+import BotStone from "./bot-stone";
 
 type Props = {
     icon_size?: number;
     img_props?: Pick<ComponentProps<"svg">, "className">;
 };
 
+/**
+ * The Cobble mark: the ember stone. Source of truth is
+ * `public/logos/logo.svg` (copied from `public/brand/icons/ember.svg`).
+ */
 export default function LogoIcon({ icon_size = 40, img_props }: Props) {
     return (
-        <svg
-            width={icon_size}
-            height={icon_size}
-            viewBox="0 0 512 512"
-            role="img"
-            aria-label="Logo Icon"
-            className={twMerge("shrink-0", img_props?.className)}
-        >
-            <rect
-                x="16"
-                y="16"
-                width="480"
-                height="480"
-                rx="120"
-                className="fill-slate-900 dark:fill-slate-800"
-            />
-            <path
-                d="M290 100 L144 286 H244 L222 412 L368 226 H268 Z"
-                strokeWidth="28"
-                strokeLinejoin="round"
-                className="fill-white stroke-white"
-            />
-        </svg>
+        <BotStone
+            hue="ember"
+            size={icon_size}
+            label="Logo Icon"
+            className={img_props?.className}
+        />
     );
 }