refactor: Update dialog and simplify drop import logic

* Handle Qt events for main window in ts_qt.py

* Replace magic values with enums

* Match import duplicate file dialog to delete missing entry dialog

* Remove excessive progess widgets

* Add docstrings and logging

Author: seakrueger

tagstudio/src/qt/modals/delete_unlinked.py

@@ -77,7 +77,9 @@ def refresh_list(self):
 
         self.model.clear()
         for i in self.tracker.missing_files:
-            self.model.appendRow(QStandardItem(str(i.path)))
+            item = QStandardItem(str(i.path))
+            item.setEditable(False)
+            self.model.appendRow(item)
 
     def delete_entries(self):
         pw = ProgressWidget(