Add time resolution functionality to scheduler GUI

b_asic/scheduler_gui/axes_item.py

@@ -104,7 +104,7 @@ class AxesItem(QGraphicsItemGroup):
         self._base_pen.setJoinStyle(Qt.PenJoinStyle.MiterJoin)
         self._ledger_pen = QPen(Qt.GlobalColor.lightGray)
         self._ledger_pen.setWidthF(0)  # 0 = cosmetic pen 1px width
-        self._timeline_pen = QPen(Qt.GlobalColor.red)
+        self._timeline_pen = QPen(Qt.GlobalColor.black)
         self._timeline_pen.setWidthF(2 / self._scale)
         self._timeline_pen.setStyle(Qt.PenStyle.DashLine)