feat: add Settings and Suite pages with comprehensive settings management and question suite builder

- Implemented SettingsPage for configuring default provider, temperature, and model paths.
- Added SuitePage for managing a suite of questions with features to add, edit, duplicate, and delete questions.
- Introduced TypeScript configuration files for app and node environments.
- Set up Vite configuration for development server with API proxying to backend.

app.py

@@ -0,0 +1,114 @@
+#!/usr/bin/env python3
+"""LM-Gambit desktop entrypoint.
+
+Starts the FastAPI backend, serves the compiled React interface from the same
+origin and opens a browser at it:
+
+    python app.py
+
+For frontend development run the Vite dev server alongside it instead:
+
+    python app.py --no-browser        # terminal 1
+    cd web && npm run dev             # terminal 2  -> http://localhost:5173
+"""
+
+from __future__ import annotations
+
+import argparse
+import socket
+import sys
+import threading
+import webbrowser
+from pathlib import Path
+
+ROOT_DIR = Path(__file__).resolve().parent
+if str(ROOT_DIR) not in sys.path:
+    sys.path.insert(0, str(ROOT_DIR))
+
+DEFAULT_PORT = 8765
+WEB_DIST = ROOT_DIR / "web" / "dist"
+
+
+def port_is_free(host: str, port: int) -> bool:
+    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as probe:
+        probe.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
+        try:
+            probe.bind((host, port))
+        except OSError:
+            return False
+    return True
+
+
+def find_port(host: str, preferred: int) -> int:
+    for candidate in range(preferred, preferred + 20):
+        if port_is_free(host, candidate):
+            return candidate
+    raise SystemExit(
+        f"No free port found between {preferred} and {preferred + 19}. "
+        "Pass --port to choose one explicitly."
+    )
+
+
+def main() -> int:
+    parser = argparse.ArgumentParser(
+        prog="app.py",
+        description="Run the LM-Gambit web interface.",
+    )
+    parser.add_argument("--host", default="127.0.0.1", help="Interface to bind (default: 127.0.0.1)")
+    parser.add_argument(
+        "--port",
+        type=int,
+        default=DEFAULT_PORT,
+        help=f"Port to serve on (default: {DEFAULT_PORT}; the next free one is used if taken)",
+    )
+    parser.add_argument("--no-browser", action="store_true", help="Do not open a browser window")
+    parser.add_argument("--reload", action="store_true", help="Auto-reload on Python changes (dev)")
+    args = parser.parse_args()
+
+    try:
+        import uvicorn
+    except ImportError:
+        print(
+            "FastAPI/uvicorn are not installed.\n"
+            "  python -m pip install -r requirements.txt",
+            file=sys.stderr,
+        )
+        return 1
+
+    port = args.port if port_is_free(args.host, args.port) else find_port(args.host, args.port)
+    url = f"http://{'localhost' if args.host in {'127.0.0.1', '0.0.0.0'} else args.host}:{port}"
+
+    if not (WEB_DIST / "index.html").is_file():
+        print(
+            "The web interface has not been built yet.\n"
+            "  cd web && npm install && npm run build\n"
+            f"Starting the API anyway — docs at {url}/api/docs\n",
+            file=sys.stderr,
+        )
+    elif not args.no_browser:
+        threading.Timer(1.0, lambda: webbrowser.open(url)).start()
+
+    print(f"\n  LM-Gambit  ->  {url}\n  Press Ctrl+C to stop.\n")
+
+    uvicorn.run(
+        "server.main:app" if args.reload else _build_app(),
+        host=args.host,
+        port=port,
+        reload=args.reload,
+        log_level="info",
+        access_log=False,
+    )
+    return 0
+
+
+def _build_app():
+    from server.main import create_app
+
+    return create_app()
+
+
+if __name__ == "__main__":
+    try:
+        raise SystemExit(main())
+    except KeyboardInterrupt:
+        print("\nStopped.")