Add WebDAV lifecycle UI feedback

main.go

@@ -465,9 +465,9 @@ func (u *ui) describeActionError(label string, err error) string {
 		return ""
 	}
 	if errors.Is(err, webdav.ErrConflict) || strings.Contains(err.Error(), webdav.ErrConflict.Error()) {
-		return "Save conflict: the remote vault changed. Reopen it and retry the save."
+		return fmt.Sprintf("%s failed: remote vault changed on the server; reopen the remote vault and retry", label)
 	}
-	return err.Error()
+	return fmt.Sprintf("%s failed: %v", label, err)
 }
 
 func (u *ui) bannerSurface() uiBanner {
@@ -728,6 +728,8 @@ func (u *ui) header(gtx layout.Context) layout.Dimensions {
 				}),
 				layout.Rigid(layout.Spacer{Height: unit.Dp(8)}.Layout),
 				layout.Rigid(u.lifecycleControls),
+				layout.Rigid(layout.Spacer{Height: unit.Dp(8)}.Layout),
+				layout.Rigid(u.feedbackBanner),
 			)
 		})
 	}
@@ -758,6 +760,8 @@ func (u *ui) header(gtx layout.Context) layout.Dimensions {
 			}),
 			layout.Rigid(layout.Spacer{Height: unit.Dp(10)}.Layout),
 			layout.Rigid(u.lifecycleControls),
+			layout.Rigid(layout.Spacer{Height: unit.Dp(10)}.Layout),
+			layout.Rigid(u.feedbackBanner),
 		)
 	})
 }
@@ -1295,6 +1299,27 @@ func detailLine(th *material.Theme, label, value string) layout.Widget {
 	}
 }
 
+func (u *ui) feedbackBanner(gtx layout.Context) layout.Dimensions {
+	message := u.statusMessage
+	tone := color.NRGBA{R: 231, G: 239, B: 235, A: 255}
+	textColor := accentColor
+	if u.errorMessage != "" {
+		message = u.errorMessage
+		tone = color.NRGBA{R: 248, G: 226, B: 223, A: 255}
+		textColor = color.NRGBA{R: 140, G: 46, B: 34, A: 255}
+	}
+	if message == "" {
+		return layout.Dimensions{}
+	}
+	return layout.Background{}.Layout(gtx, fill(tone), func(gtx layout.Context) layout.Dimensions {
+		return layout.UniformInset(unit.Dp(10)).Layout(gtx, func(gtx layout.Context) layout.Dimensions {
+			lbl := material.Label(u.theme, unit.Sp(13), message)
+			lbl.Color = textColor
+			return lbl.Layout(gtx)
+		})
+	})
+}
+
 func (u *ui) passwordLine(label, value string) layout.Widget {
 	return func(gtx layout.Context) layout.Dimensions {
 		icon := u.eyeIcon