Check agent CLI sign-in in server setup with a sign-in button

mac/Sources/Byre/Server.swift

@@ -36,6 +36,12 @@ struct Check: Decodable {
     let tool: String
     let fix: String
     let blocking: Bool
+    let signedOut: Bool
+
+    enum CodingKeys: String, CodingKey {
+        case name, need, `for`, ok, tool, fix, blocking
+        case signedOut = "signed_out"
+    }
 }
 
 struct Checks: Decodable {
@@ -75,7 +81,7 @@ struct ChecksView: View {
         if check.ok {
             return Text("Found").foregroundStyle(Palette.ok)
         }
-        return Text("Missing").foregroundStyle(check.blocking ? Palette.danger : Palette.muted)
+        return Text(check.signedOut ? "Not signed in" : "Missing").foregroundStyle(check.blocking ? Palette.danger : Palette.muted)
     }
 
     private func need(_ check: Check) -> String {

mac/Sources/Byre/Startup.swift

@@ -451,7 +451,7 @@ struct ConnectView: View {
             }
             #if os(macOS)
             if !form.missing.isEmpty {
-                Text("byre can't run on this Mac yet. Install what's missing, then click Run byre on this Mac again.")
+                Text("byre can't run on this Mac yet. Install what's missing and sign in, then click Run byre on this Mac again.")
                     .fixedSize(horizontal: false, vertical: true)
                     .padding(.top, 6)
                 ChecksView(checks: form.missing)