Fix CI test failures from incomplete dummy config and encoding

8 test files had _DummyConfigManager missing get_active_media_server(),
causing failures when pytest ran them before the test file that had it.
Whichever file set sys.modules first won, and the incomplete dummy broke
later tests. Also fix script.js read_text() missing encoding='utf-8'
which failed on non-UTF-8 default locales.

tests/test_album_completeness_job.py

@@ -30,6 +30,9 @@ if "config.settings" not in sys.modules:
         def get(self, key, default=None):
             return default
 
+        def get_active_media_server(self):
+            return "plex"
+
     settings_mod.config_manager = _DummyConfigManager()
     config_pkg.settings = settings_mod
     sys.modules["config"] = config_pkg

tests/test_library_reorganize.py

@@ -28,6 +28,9 @@ if 'config.settings' not in sys.modules:
         def get(self, key, default=None):
             return default
 
+        def get_active_media_server(self):
+            return "plex"
+
     settings_mod.config_manager = _DummyConfigManager()
     config_mod.settings = settings_mod
     sys.modules['config'] = config_mod

tests/test_metadata_gap_filler.py

@@ -29,6 +29,9 @@ if 'config.settings' not in sys.modules:
         def get(self, key, default=None):
             return default
 
+        def get_active_media_server(self):
+            return "plex"
+
     settings_mod.config_manager = _DummyConfigManager()
     config_mod.settings = settings_mod
     sys.modules['config'] = config_mod

tests/test_metadata_service_cache.py

@@ -32,6 +32,9 @@ if "config.settings" not in sys.modules:
         def get(self, key, default=None):
             return default
 
+        def get_active_media_server(self):
+            return "plex"
+
     settings_mod.config_manager = _DummyConfigManager()
     config_pkg.settings = settings_mod
     sys.modules["config"] = config_pkg

tests/test_missing_cover_art.py

@@ -29,6 +29,9 @@ if 'config.settings' not in sys.modules:
         def get(self, key, default=None):
             return default
 
+        def get_active_media_server(self):
+            return "plex"
+
     settings_mod.config_manager = _DummyConfigManager()
     config_mod.settings = settings_mod
     sys.modules['config'] = config_mod

tests/test_repair_worker_album_fill.py

@@ -33,6 +33,9 @@ if "config.settings" not in sys.modules:
         def get(self, key, default=None):
             return default
 
+        def get_active_media_server(self):
+            return "plex"
+
     settings_mod.config_manager = _DummyConfigManager()
     config_pkg.settings = settings_mod
     sys.modules["config"] = config_pkg

tests/test_track_number_repair.py

@@ -28,6 +28,9 @@ if 'config.settings' not in sys.modules:
         def get(self, key, default=None):
             return default
 
+        def get_active_media_server(self):
+            return "plex"
+
     settings_mod.config_manager = _DummyConfigManager()
     config_mod.settings = settings_mod
     sys.modules['config'] = config_mod

tests/test_unknown_artist_fixer.py

@@ -30,6 +30,9 @@ if "config.settings" not in sys.modules:
         def get(self, key, default=None):
             return default
 
+        def get_active_media_server(self):
+            return "plex"
+
     settings_mod.config_manager = _DummyConfigManager()
     config_pkg.settings = settings_mod
     sys.modules["config"] = config_pkg

tests/test_websocket_client_transport.py

@@ -3,6 +3,6 @@ from pathlib import Path
 
 def test_websocket_client_prefers_polling_before_websocket():
     script_path = Path(__file__).resolve().parents[1] / "webui" / "static" / "script.js"
-    script = script_path.read_text()
+    script = script_path.read_text(encoding="utf-8")
 
     assert "transports: ['polling', 'websocket']" in script