GODT-1210: "free user" banner

internal/frontend/qml/Banner.qml

@@ -40,6 +40,8 @@ Popup {
 
     shouldShow: notification ? (notification.active && !notification.dismissed) : false
 
+    modal: false
+
     Action {
         id: defaultDismissAction
 

internal/frontend/qml/BridgeTest/UserControl.qml

@@ -129,7 +129,7 @@ ColumnLayout {
             text: "free user error"
             enabled: user !== undefined //&& user.isLoginRequested
             onClicked: {
-                root.backend.loginFreeUserError("")
+                root.backend.loginFreeUserError()
                 user.resetLoginRequests()
             }
         }

internal/frontend/qml/Bridge_test.qml

@@ -634,7 +634,7 @@ Window {
 
     // this signals are used only when trying to login with new user (i.e. not in users model)
     signal loginUsernamePasswordError(string errorMsg)
-    signal loginFreeUserError(string errorMsg)
+    signal loginFreeUserError()
     signal loginConnectionError(string errorMsg)
     signal login2FARequested()
     signal login2FAError(string errorMsg)

internal/frontend/qt/frontend_users.go

@@ -22,6 +22,7 @@ package qt
 import (
 	"context"
 	"encoding/base64"
+
 	"github.com/ProtonMail/proton-bridge/internal/users"
 	"github.com/ProtonMail/proton-bridge/pkg/pmapi"
 )
@@ -38,7 +39,11 @@ func (f *FrontendQt) login(username, password string) {
 
 	f.authClient, f.auth, err = f.bridge.Login(username, f.password)
 	if err != nil {
-		// TODO login free user error
+		if err == pmapi.ErrPaidPlanRequired {
+			f.qml.LoginFreeUserError()
+			f.loginClean()
+			return
+		}
 		f.qml.LoginUsernamePasswordError(err.Error())
 		f.loginClean()
 		return

internal/frontend/qt/qml_backend.go

@@ -55,7 +55,7 @@ type QMLBackend struct {
 	_ func(username, password string) `slot:"login2Password"`
 	_ func(username string)           `slot:"loginAbort"`
 	_ func(errorMsg string)           `signal:"loginUsernamePasswordError"`
-	_ func(errorMsg string)           `signal:"loginFreeUserError"`
+	_ func()                          `signal:"loginFreeUserError"`
 	_ func(errorMsg string)           `signal:"loginConnectionError"`
 	_ func()                          `signal:"login2FARequested"`
 	_ func(errorMsg string)           `signal:"login2FAError"`