refactor(image_roi): glowing handles for Rectangle roi

bec_widgets/widgets/plots/image/image.py

@@ -369,6 +369,7 @@ class Image(PlotBase):
         # Add to plot and controller (controller assigns color)
         self.plot_item.addItem(roi)
         self.roi_controller.add_roi(roi)
+        roi.add_scale_handle()
         return roi
 
     def remove_roi(self, roi: int | str):

bec_widgets/widgets/plots/roi/image_roi.py

@@ -414,8 +414,6 @@ class RectangularROI(BaseROI, pg.RectROI):
 
         self.sigRegionChanged.connect(self._on_region_changed)
         self.adorner = LabelAdorner(roi=self)
-        if resize_handles:
-            self.add_scale_handle()
         self.hoverPen = fn.mkPen(color=(255, 0, 0), width=3, style=QtCore.Qt.DashLine)
         self.handleHoverPen = fn.mkPen("lime", width=4)
 
@@ -440,6 +438,11 @@ class RectangularROI(BaseROI, pg.RectROI):
         self.addScaleHandle([0, 0.5], [1, 0.5])  # left edge
         self.addScaleHandle([1, 0.5], [0, 0.5])  # right edge
 
+        self.handlePen = fn.mkPen("#ffff00", width=5)  # bright yellow outline
+        self.handleHoverPen = fn.mkPen("#00ffff", width=4)  # cyan, thicker when hovered
+        self.handleBrush = (200, 200, 0, 120)  # semi-transparent fill
+        self.handleHoverBrush = (0, 255, 255, 160)
+
     def _on_region_changed(self):
         """
         Handles ROI region change events.

tests/unit_tests/test_image_rois.py

@@ -3,9 +3,7 @@ from __future__ import annotations
 from typing import Literal
 
 import numpy as np
-import pyqtgraph as pg
 import pytest
-from qtpy.QtCore import QPointF
 
 from bec_widgets.widgets.plots.image.image import Image
 from bec_widgets.widgets.plots.roi.image_roi import CircularROI, RectangularROI, ROIController