viewer: white, compact, right-aligned ROI numeric fields

The ROI bound editors now have a white background, a capped width and
right-aligned text, which reads better for numeric entry.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

viewer/widgets/JFJochViewerROIList.cpp

@@ -49,8 +49,11 @@ JFJochViewerROIList::JFJochViewerROIList(QWidget *parent) : QWidget(parent) {
     for (int i = 0; i < 4; i++) {
         flabel_[i] = new QLabel("", this);
         fedit_[i] = new QLineEdit(this);
+        fedit_[i]->setAlignment(Qt::AlignRight);
+        fedit_[i]->setMaximumWidth(90);
+        fedit_[i]->setStyleSheet("background-color: white; color: black;");
         grid->addWidget(flabel_[i], i, 0);
-        grid->addWidget(fedit_[i], i, 1);
+        grid->addWidget(fedit_[i], i, 1, Qt::AlignRight);
         connect(fedit_[i], &QLineEdit::editingFinished, this, &JFJochViewerROIList::ApplyEditor);
     }
     layout->addLayout(grid);