fix: pass selected cache path to conversion worker

- Worker now accepts cache_path parameter
- _start_conversion passes the selected path to worker
- Fixes 'Cache folder not found' error during conversion

ui/tga_converter_dialog.py

@@ -29,17 +29,22 @@ class TGAConvertWorker(QThread):
     conversion_complete = pyqtSignal(int, int)  # success_count, total_count
     conversion_error = pyqtSignal(str)
     
-    def __init__(self, converter: TGAConverter):
+    def __init__(self, converter: TGAConverter, cache_path: Optional[Path] = None):
         super().__init__()
         self.converter = converter
+        self.cache_path = cache_path
         self._is_running = True
     
     def run(self):
         """Run the conversion."""
         try:
-            # Find cache folder
-            self.progress_update.emit("Finding cache folder...")
-            cache_path = self.converter.find_cache_folder()
+            # Use provided cache path or find it
+            if self.cache_path and self.cache_path.exists():
+                cache_path = self.cache_path
+                self.progress_update.emit(f"Using cache folder: {cache_path}")
+            else:
+                self.progress_update.emit("Finding cache folder...")
+                cache_path = self.converter.find_cache_folder()
             
             if not cache_path:
                 self.conversion_error.emit("Cache folder not found")
@@ -281,8 +286,9 @@ class TGAConverterDialog(QDialog):
         self.results_list.clear()
         self.converted_files = []
         
-        # Start worker
-        self.convert_worker = TGAConvertWorker(self.converter)
+        # Start worker with the selected cache path
+        cache_path = self.converter._cache_path if self.converter._cache_path else None
+        self.convert_worker = TGAConvertWorker(self.converter, cache_path)
         self.convert_worker.progress_update.connect(self._on_progress)
         self.convert_worker.file_converted.connect(self._on_file_converted)
         self.convert_worker.conversion_complete.connect(self._on_conversion_complete)