clan-lib: Fix @API.register_abstract not throwing correct error when called directly without implementation

clan-app: Fix mypy lint

clan-lib: Mark test as with_core

pkgs/clan-app/clan_app/deps/webview/webview.py

@@ -126,7 +126,7 @@ class Webview:
             )
         else:
             bridge = WebviewBridge(
-                webview=self, middleware_chain=tuple(self._middleware)
+                webview=self, middleware_chain=tuple(self._middleware), threads={}
             )
         self._bridge = bridge
         return bridge