client/web: split login from nodeUpdate

This creates a new /api/up endpoint which is exposed in the login
client, and is solely focused on logging in. Login has been removed from
the nodeUpdate endpoint.

This also adds support in the LoginClientView for a stopped node that
just needs to reconnect, but not necessarily reauthenticate.  This
follows the same pattern in `tailscale up` of just setting the
WantRunning user pref.

Updates tailscale/corp#14335

Signed-off-by: Will Norris <will@tailscale.com>

client/web/src/components/app.tsx

@@ -3,7 +3,7 @@ import React, { useEffect } from "react"
 import LoginToggle from "src/components/login-toggle"
 import DeviceDetailsView from "src/components/views/device-details-view"
 import HomeView from "src/components/views/home-view"
-import LoginClientView from "src/components/views/login-client-view"
+import LoginView from "src/components/views/login-view"
 import SSHView from "src/components/views/ssh-view"
 import { UpdatingView } from "src/components/views/updating-view"
 import useAuth, { AuthResponse } from "src/hooks/auth"
@@ -39,12 +39,11 @@ function WebClient({
 
   return !data ? (
     <div className="text-center py-14">Loading...</div>
-  ) : data.Status === "NeedsLogin" || data.Status === "NoState" ? (
+  ) : data.Status === "NeedsLogin" ||
+    data.Status === "NoState" ||
+    data.Status === "Stopped" ? (
     // Client not on a tailnet, render login.
-    <LoginClientView
-      data={data}
-      onLoginClick={() => updateNode({ Reauthenticate: true })}
-    />
+    <LoginView data={data} refreshData={refreshData} />
   ) : (
     // Otherwise render the new web client.
     <>