fix: respect manually selected cache folder path

- _scan_cache now checks if manual path is set before auto-finding
- Fixes issue where browsing and selecting path was ignored

ui/tga_converter_dialog.py

@@ -218,7 +218,11 @@ class TGAConverterDialog(QDialog):
         self.files_list.clear()
         self.files_count_label.setText("Scanning...")
         
-        cache_path = self.converter.find_cache_folder()
+        # Use manually set path if available, otherwise find it
+        if self.converter._cache_path and self.converter._cache_path.exists():
+            cache_path = self.converter._cache_path
+        else:
+            cache_path = self.converter.find_cache_folder()
         
         if cache_path:
             self.cache_path_label.setText(str(cache_path))