Give bots tools and MCP servers per bot and workspace, with status and tests

- Bots and workspaces get tools and MCP servers from their settings
  pages; bots also from chips under the chat composer, removable there
- "Every bot" now gives one to every bot now and every new bot; each can
  still drop it (attach-every-bot-extensions.ts moves old installs over)
- Status lines: MCP servers record whether they connect, tools whether
  their last run worked
- Test connection in the MCP form and a Test panel in the tool form check
  the form as it is, without saving
- Hide Google sign-in on the login form

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

src/components/general/extension-icon.tsx

@@ -0,0 +1,9 @@
+import { Plug, Wrench } from "lucide-react";
+import type { BotExtension } from "@/src/types";
+
+/**
+ * The icon of an MCP server (a plug) or a tool (a wrench).
+ */
+export default function extensionIcon({ kind }: { kind: BotExtension["kind"] }) {
+    return kind == "mcp" ? Plug : Wrench;
+}