include pythonnet runtime DLLs in build process to prevent missing dependencies

build.py

@@ -44,6 +44,21 @@ def build(build: bool = True, copy: bool = True, test: bool = False, dest: str |
             except Exception as e:
                 print(f"Warning: couldn't locate dicognito package: {e}")
 
+            # Try to include pythonnet runtime DLLs to avoid missing
+            # Python.Runtime.dll at runtime (used by pythonnet / webview).
+            add_binary_args = []
+            try:
+                spec_py = importlib.util.find_spec("pythonnet")
+                if spec_py and spec_py.submodule_search_locations:
+                    pn_path = Path(spec_py.submodule_search_locations[0])
+                    runtime_dir = pn_path / "runtime"
+                    if runtime_dir.exists():
+                        for f in runtime_dir.rglob("*.dll"):
+                            # PyInstaller on Windows expects 'src;dest'
+                            add_binary_args += ["--add-binary", f"{str(f)};pythonnet\\runtime"]
+            except Exception as e:
+                print(f"Warning: couldn't locate pythonnet runtime: {e}")
+
             PyInstaller.__main__.run([
                 str(project_root / "nice.py"),
                 "--onefile",
@@ -55,7 +70,7 @@ def build(build: bool = True, copy: bool = True, test: bool = False, dest: str |
                 str(project_root / "build" / "test"),
                 "--specpath",
                 str(project_root / "build" / "specs"),
-            ] + add_data_args + [
+            ] + add_data_args + add_binary_args + [
                 # add some common hidden imports that PyInstaller sometimes misses
                 "--hidden-import",
                 "bs4",