fix(backend): standardize superset client init and auth

- Update plugins (debug, mapper, search) to explicitly map environment config to SupersetConfig
- Add authenticate method to SupersetClient for explicit session management
- Add get_environment method to ConfigManager
- Fix navbar dropdown hover stability in frontend with invisible bridge

superset_tool/client.py

@@ -29,6 +29,14 @@ from superset_tool.utils.network import APIClient
 # @RELATION: CREATES_INSTANCE_OF -> APIClient
 # @RELATION: USES -> SupersetConfig
 class SupersetClient:
+    # [DEF:authenticate:Function]
+    # @PURPOSE: Authenticates the client using the configured credentials.
+    # @PRE: self.network must be initialized with valid auth configuration.
+    # @POST: Client is authenticated and tokens are stored.
+    # @RETURN: Dict[str, str] - Authentication tokens.
+    def authenticate(self):
+        with belief_scope("SupersetClient.authenticate"):
+            return self.network.authenticate()
     # [DEF:__init__:Function]
     # @PURPOSE: Инициализирует клиент, проверяет конфигурацию и создает сетевой клиент.
     # @PRE:  `config` должен быть валидным объектом SupersetConfig.