chore: lock the plugin boundary and remove 2.9.0 leftovers

plugins/tailscale/src/backend/ssh-auth-provider.ts

@@ -13,6 +13,8 @@ const AUTH_FAILED_PATTERN = /All configured authentication methods failed/i;
 export const tailscaleSshAuthProvider: PluginSshAuthProvider = {
   type: "tailscale",
   labelKey: "hosts.filterAuthTailscale",
+  // Nothing host-specific to look up, so it works for an unsaved host.
+  quickConnect: true,
   connectOptions: (_host, purpose) =>
     purpose === "terminal"
       ? {