A picture picked is the form's at once, not once its preview is made

Settings' profile kept a picked avatar or header only after the browser had made its small preview, so a Save clicked
meanwhile saved the profile without it and said nothing; the composer added a picture to the post only after its
thumbnail, so a Publish meanwhile left it out. Both now take the file (and the composer starts its upload) as soon as
it is picked, and fill the preview in afterwards; a preview the browser can't make no longer drops the picture,
PrivaPub decides. Found by the e2e suite under load.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LsXgEaXee4GCU1hwYgPJXw

Components/Composer.razor

@@ -518,12 +518,13 @@
 				continue;
 			}
 
+			// the post's at once, and uploading (a publish meanwhile waits for it); its small picture follows
 			var media = new UploadMedia { File = file, FileName = file.Name, ContentType = type, Size = file.Size };
-			if (type.StartsWith("image/"))
-				media.Preview = await Thumbnail(file);
 			form.Media.Add(media);
 			altTextConfirmed = false;
 			Start(media);
+			if (type.StartsWith("image/"))
+				media.Preview = await Thumbnail(file);
 		}
 	}
 

Components/Settings/ProfileEditor.razor

@@ -200,8 +200,13 @@ else
 			return;
 		}
 
-		// the file is sent as it is when saving; only a small picture of it is kept to show it now
+		// the file is sent as it is when saving, and is the form's at once (a save meanwhile sends it); only a small picture
+		// of it is kept to show it, made afterwards, and PrivaPub decides about a file the browser can't draw
 		var picture = new UploadMedia { File = file, FileName = file.Name, ContentType = file.ContentType, Size = file.Size };
+		if (isAvatar)
+			form.Avatar = picture;
+		else
+			form.Header = picture;
 		try
 		{
 			var small = await file.RequestImageFileAsync("image/jpeg", isAvatar ? 240 : 900, isAvatar ? 240 : 300);
@@ -212,14 +217,8 @@ else
 		}
 		catch (Exception ex)
 		{
-			await Logger.ProcessError(ex, $"{nameof(ProfileEditor)}.{nameof(Pick)}:{file.Name}");
-			pictureErrors.Add(Localizer["The file \"{0}\" could not be read.", file.Name]);
-			return;
+			await Logger.ProcessWarning(ex.Message, $"{nameof(ProfileEditor)}.{nameof(Pick)}:{file.Name}");
 		}
-		if (isAvatar)
-			form.Avatar = picture;
-		else
-			form.Header = picture;
 	}
 
 	async Task RemovePicture(bool avatar)