fix path errors

examples/gui/viewer3d/dashboard.py

@@ -646,22 +646,42 @@ class FingerDashboardWindow(QMainWindow):
             self._update_play_enabled_for_source()
 
     def _select_config(self) -> None:
+        from .preferences import (
+            default_finger_config,
+            normalize_config_preference,
+            packaged_finger_bundle_root,
+        )
+
+        start = packaged_finger_bundle_root()
+        start_dir = str(start) if start is not None else "sensors/finger"
         path, _ = QFileDialog.getOpenFileName(
             self,
             "选择配置文件",
-            "config",
+            start_dir,
             "JSON (*.json);;所有文件 (*)",
         )
         if path:
-            self.settings_panel.set_config_path(path)
-            self.config.config = path
+            config = normalize_config_preference(path) or default_finger_config()
+            self.settings_panel.set_config_path(config)
+            self.config.config = config
             self._save_preferences()
 
     def _select_finger_assets(self) -> None:
+        from .preferences import (
+            default_finger_assets_dir,
+            default_finger_config,
+            normalize_assets_preference,
+            normalize_config_preference,
+            packaged_finger_bundle_root,
+        )
+
+        start = packaged_finger_bundle_root()
         path = QFileDialog.getExistingDirectory(
             self,
             "选择传感器 bundle 目录",
-            self.settings_panel.sensor_bundle_dir() or "sensors/finger",
+            str(start) if start is not None else (
+                self.settings_panel.sensor_bundle_dir() or "sensors/finger"
+            ),
         )
         if path:
             bundle_dir = Path(path)
@@ -677,12 +697,13 @@ class FingerDashboardWindow(QMainWindow):
                 if isinstance(rel_assets, str) and rel_assets.strip():
                     assets_dir = bundle_dir / rel_assets
             if config_path.is_file():
-                self.settings_panel.set_config_path(str(config_path))
-                self.config.config = str(config_path)
-            self.settings_panel.set_finger_export_dir(str(assets_dir))
-            self.config.export_dir = str(assets_dir)
+                config = normalize_config_preference(str(config_path)) or default_finger_config()
+                self.settings_panel.set_config_path(config)
+                self.config.config = config
+            assets = normalize_assets_preference(str(assets_dir)) or default_finger_assets_dir()
+            self.settings_panel.set_finger_export_dir(assets)
+            self.config.export_dir = assets
             self._save_preferences()
-
     def _select_csv_dir(self) -> None:
         path = QFileDialog.getExistingDirectory(
             self,