Let the accounts screen own the switcher instead of the settings list

The main settings list carried both an Accounts row and a switcher row
beside it — two account controls at the top level, one of them opening
the screen the other belonged on. The switcher row moves to the top of
the accounts screen as a Current Account section, where the selection
it names sits directly above the checkmarked row it corresponds to.

The subscriptions-settings row and the macOS sidebar footer keep
theirs: those are contextual surfaces, not the settings list.

Yattee/Localizable.xcstrings

@@ -461,6 +461,17 @@
         }
       }
     },
+    "accounts.switcher.section" : {
+      "comment" : "Header of the accounts screen section holding the account switcher",
+      "localizations" : {
+        "en" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "Current Account"
+          }
+        }
+      }
+    },
     "accounts.switcher.title" : {
       "comment" : "Label of the control that switches the selected account",
       "localizations" : {

Yattee/Views/Settings/AccountsListView.swift

@@ -123,6 +123,16 @@ struct AccountsListView: View {
             emptyState
         } else {
             Form {
+                // The switcher lives here rather than beside the Accounts row
+                // in Settings: which account is current is this screen's
+                // subject, and the row below names the same account the
+                // checkmarked row further down is marked as.
+                Section {
+                    DataContextSwitcherSettingsRow()
+                } header: {
+                    Text(String(localized: "accounts.switcher.section"))
+                }
+
                 ForEach(groups, id: \.instance.id) { group in
                     instanceSection(group.instance, accounts: group.accounts)
                 }

Yattee/Views/Settings/SettingsView.swift

@@ -152,8 +152,6 @@ struct SettingsView: View {
                     }
                     .accessibilityIdentifier("settings.row.accounts")
 
-                    DataContextSwitcherSettingsRow()
-
                     NavigationLink {
                         TVSidebarDetailContainer(systemImage: "icloud", title: String(localized: "settings.icloud.title")) { iCloudSettingsView() }
                     } label: {
@@ -269,8 +267,6 @@ struct SettingsView: View {
                         }
                     }
                     .accessibilityIdentifier("settings.row.accounts")
-
-                    DataContextSwitcherSettingsRow()
                     }
 
                     Section {