story-211: skip selection screen when CLI path argument provided

When a project path is passed on the command line, skip the project
selection screen in the frontend and go straight to the main UI.

Squash merge of feature/story-211

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/App.tsx

@@ -7,12 +7,27 @@ import "./App.css";
 
 function App() {
 	const [projectPath, setProjectPath] = React.useState<string | null>(null);
+	const [isCheckingProject, setIsCheckingProject] = React.useState(true);
 	const [errorMsg, setErrorMsg] = React.useState<string | null>(null);
 	const [pathInput, setPathInput] = React.useState("");
 	const [isOpening, setIsOpening] = React.useState(false);
 	const [knownProjects, setKnownProjects] = React.useState<string[]>([]);
 	const [homeDir, setHomeDir] = React.useState<string | null>(null);
 
+	React.useEffect(() => {
+		api
+			.getCurrentProject()
+			.then((path) => {
+				if (path) {
+					setProjectPath(path);
+				}
+			})
+			.catch((error) => console.error(error))
+			.finally(() => {
+				setIsCheckingProject(false);
+			});
+	}, []);
+
 	React.useEffect(() => {
 		api
 			.getKnownProjects()
@@ -138,6 +153,10 @@ function App() {
 		}
 	}
 
+	if (isCheckingProject) {
+		return null;
+	}
+
 	return (
 		<main
 			className="container"