refactor: Restructure GUI components into separate modules for improved maintainability

tidal_dl_ng/gui/progress.py

@@ -0,0 +1,31 @@
+"""Progress bars mixin for MainWindow.
+
+Handles progress bar updates and formatting.
+"""
+
+import math
+
+
+class ProgressMixin:
+    """Mixin containing progress bar management methods."""
+
+    def on_progress_reset(self):
+        """Reset progress bars to zero."""
+        self.pb_list.setValue(0)
+        self.pb_item.setValue(0)
+
+    def on_progress_list(self, value: float) -> None:
+        """Update the progress of the list progress bar."""
+        self.pb_list.setValue(int(math.ceil(value)))
+
+    def on_progress_item(self, value: float) -> None:
+        """Update the progress of the item progress bar."""
+        self.pb_item.setValue(int(math.ceil(value)))
+
+    def on_progress_item_name(self, value: str) -> None:
+        """Set the format of the item progress bar."""
+        self.pb_item.setFormat(f"%p% {value}")
+
+    def on_progress_list_name(self, value: str) -> None:
+        """Set the format of the list progress bar."""
+        self.pb_list.setFormat(f"%p% {value}")