Cody Settings: Make it more obvious which is the active account and h…

…ow to change it (#1431)

Updates the account list to add a checkmark icon and label next to the
active account. This makes it more obvious which is active, and helps
you understand to use the checkmark button to change the active account.
The account list also appears to be un

| Before | After |
| - | - |
| ![CleanShot 2024-05-01 at 15 01
39@2x](https://github.com/sourcegraph/jetbrains/assets/153/66e250ec-aca7-4086-92b6-e1dab8219a8f)
| ![CleanShot 2024-05-01 at 15 01
15@2x](https://github.com/sourcegraph/jetbrains/assets/153/5172ea58-162b-45e9-9607-7d977a68466c)
|

Note this does not fix the following existing issues:
- Account list view does not re-render until a list mouse event occurs
- Account ordering changes when active account changes and the settings
panel is closed and reopened

## Test plan

- CI
- Open "Cody Settings" and inspect the list UI

src/main/kotlin/com/sourcegraph/cody/auth/ui/SimpleAccountsListCellRenderer.kt

@@ -1,6 +1,7 @@
 package com.sourcegraph.cody.auth.ui
 
 import com.intellij.collaboration.messages.CollaborationToolsBundle
+import com.intellij.icons.AllIcons
 import com.intellij.ui.components.labels.LinkLabel
 import com.intellij.util.IconUtil
 import com.intellij.util.ui.GridBag
@@ -34,29 +35,56 @@ class SimpleAccountsListCellRenderer<A : Account, D : AccountDetails>(
   private val loadingError = JLabel()
   private val reloginLink = LinkLabel<Any?>(CollaborationToolsBundle.message("login.link"), null)
 
+  private val rightLabel = JLabel()
+
   init {
-    layout = FlowLayout(FlowLayout.LEFT, 0, 0)
+    layout = BorderLayout(0, 0)
     border = JBUI.Borders.empty(5, 8)
 
-    val namesPanel =
+    val accountDetailsPanel =
         JPanel().apply {
-          layout = GridBagLayout()
-          border = JBUI.Borders.empty(0, 6, 4, 6)
-
-          val bag =
-              GridBag()
-                  .setDefaultInsets(JBUI.insetsRight(UIUtil.DEFAULT_HGAP))
-                  .setDefaultAnchor(GridBagConstraints.WEST)
-                  .setDefaultFill(GridBagConstraints.VERTICAL)
-          add(fullName, bag.nextLine().next())
-          add(accountName, bag.next())
-          add(loadingError, bag.next())
-          add(reloginLink, bag.next())
-          add(serverName, bag.nextLine().coverLine())
+          layout = FlowLayout(FlowLayout.LEFT, 0, 0)
+
+          val namesPanel =
+              JPanel().apply {
+                layout = GridBagLayout()
+                border = JBUI.Borders.empty(0, 6, 4, 6)
+
+                val bag =
+                    GridBag()
+                        .setDefaultInsets(JBUI.insetsRight(UIUtil.DEFAULT_HGAP))
+                        .setDefaultAnchor(GridBagConstraints.WEST)
+                        .setDefaultFill(GridBagConstraints.VERTICAL)
+                add(fullName, bag.nextLine().next())
+                add(accountName, bag.next())
+                add(loadingError, bag.next())
+                add(reloginLink, bag.next())
+                add(serverName, bag.nextLine().coverLine())
+              }
+
+          add(profilePicture)
+          add(namesPanel)
         }
 
-    add(profilePicture)
-    add(namesPanel)
+    val rightLabelPanel =
+        JPanel().apply {
+          layout = FlowLayout(FlowLayout.RIGHT, 0, 0)
+          add(rightLabel)
+        }
+
+    val rightPanelWrapper =
+        JPanel(GridBagLayout()).apply {
+          val constraints =
+              GridBagConstraints().apply {
+                gridx = 0
+                gridy = 0
+                anchor = GridBagConstraints.CENTER
+              }
+          add(rightLabelPanel, constraints)
+        }
+
+    add(accountDetailsPanel, BorderLayout.WEST)
+    add(rightPanelWrapper, BorderLayout.EAST)
   }
 
   override fun getListCellRendererComponent(
@@ -92,6 +120,16 @@ class SimpleAccountsListCellRenderer<A : Account, D : AccountDetails>(
       isVisible = getDetails(account)?.name != null
       foreground = primaryTextColor
     }
+    rightLabel.apply {
+      if (isDefault(account)) {
+        icon = AllIcons.Actions.Checked_selected
+        text = "Active"
+        iconTextGap = JBUI.scale(4)
+      } else {
+        icon = null
+        text = null
+      }
+    }
     loadingError.apply {
       text = getError(account)
       foreground = UIUtil.getErrorForeground()