ui/UserView: show custom control server URL in account switcher

Fixes tailscale/corp#23660

Brings each row of the account switcher to parity with iOS by using `LoginName` instead of `DisplayName`, and showing a custom control server hostname as a third row when it is set.

Signed-off-by: Andrea Gottardo <[email protected]>

Author: agottardo

android/src/main/java/com/tailscale/ipn/ui/model/IpnState.kt

@@ -123,9 +123,15 @@ class IpnLocal {
       val UserProfile: Tailcfg.UserProfile,
       val NetworkProfile: Tailcfg.NetworkProfile? = null,
       val LocalUserID: String,
+      var ControlURL: String? = null,
   ) {
     fun isEmpty(): Boolean {
       return ID.isEmpty()
     }
+
+    // Returns true if the profile uses a custom control server (not Tailscale SaaS).
+    fun isUsingCustomControlServer(): Boolean {
+      return ControlURL != null && ControlURL != "controlplane.tailscale.com"
+    }
   }
 }

android/src/main/java/com/tailscale/ipn/ui/view/UserView.kt

@@ -5,6 +5,7 @@ package com.tailscale.ipn.ui.view
 
 import androidx.compose.foundation.clickable
 import androidx.compose.foundation.layout.Box
+import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.offset
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.automirrored.filled.KeyboardArrowRight
@@ -54,17 +55,26 @@ fun UserView(
           leadingContent = { Avatar(profile = profile, size = 36) },
           headlineContent = {
             AutoResizingText(
-                text = profile.UserProfile.DisplayName,
+                text = profile.UserProfile.LoginName,
                 style = MaterialTheme.typography.titleMedium.short,
                 minFontSize = MaterialTheme.typography.minTextSize,
                 overflow = TextOverflow.Ellipsis)
           },
           supportingContent = {
-            AutoResizingText(
-                text = profile.NetworkProfile?.DomainName ?: "",
-                style = MaterialTheme.typography.bodyMedium.short,
-                minFontSize = MaterialTheme.typography.minTextSize,
-                overflow = TextOverflow.Ellipsis)
+            Column {
+              AutoResizingText(
+                  text = profile.NetworkProfile?.DomainName ?: "",
+                  style = MaterialTheme.typography.bodyMedium.short,
+                  minFontSize = MaterialTheme.typography.minTextSize,
+                  overflow = TextOverflow.Ellipsis)
+              if (profile.isUsingCustomControlServer()) {
+                AutoResizingText(
+                    text = profile.ControlURL ?: "",
+                    style = MaterialTheme.typography.bodyMedium.short,
+                    minFontSize = MaterialTheme.typography.minTextSize,
+                    overflow = TextOverflow.Ellipsis)
+              }
+            }
           },
           trailingContent = {
             when (actionState) {