refactor: Modify the display and interaction related to worklist.

src/stylesheet/Dark2.css

@@ -172,6 +172,18 @@ QTableView {
     margin: 5 0 5 5;
 }
 
+QTreeView {
+    border: none;
+    alternate-background-color: #595959;
+    selection-color: #fcfcfc;
+    selection-background-color: #0078d8;
+    margin: 5 0 5 5;
+}
+
+QTreeView::item {
+   height: 38px;
+}
+
 QListView {
     border: none;
     margin: 5px;
@@ -846,10 +858,6 @@ QToolButton#mppsSettingsButton{
     text-align: center;
 }
 
-QPushButton#cechoButton{
-    background: #365880;
-}
-
 /*------AccountTableForm-----------------------------------------------------*/
 QWidget#commandWidgetnoBBorder {
     min-height: 123px;