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/pages/admin/bots/[bot_id]/(sections)/conversation.tsx

@@ -112,6 +112,7 @@ export default function Conversation() {
                 <Composer
                     bot={bot}
                     workspace_id={workspace_id}
+                    extensions={pageProps?.bot_extensions}
                     onSent={({ message }) => {
                         if (startsNewSession(message) && message.session_id != session_id) {
                             setSessionId(Number(message.session_id));