fix: close stuck main window on connectAfterInstall failure

Author: datlechin

TablePro/Views/Connection/ConnectionFormView.swift

@@ -1042,6 +1042,13 @@ struct ConnectionFormView: View {
             } catch {
                 Self.logger.error(
                     "Failed to connect after plugin install: \(error.localizedDescription, privacy: .public)")
+                NSApplication.shared.closeWindows(withId: "main")
+                openWindow(id: "welcome")
+                AlertHelper.showErrorSheet(
+                    title: String(localized: "Connection Failed"),
+                    message: error.localizedDescription,
+                    window: nil
+                )
             }
         }
     }