Add webapp skeletons

matrixgw_frontend/src/routes/HomeRoute.tsx

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+export function HomeRoute(): React.ReactElement {
+  return <p>Todo home route</p>;
+}

matrixgw_frontend/src/routes/NotFoundRoute.tsx

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+import { Button } from "@mui/material";
+import { RouterLink } from "../widgets/RouterLink";
+
+export function NotFoundRoute(): React.ReactElement {
+  return (
+    <div
+      style={{
+        textAlign: "center",
+        flex: "1",
+        display: "flex",
+        flexDirection: "column",
+        justifyContent: "center",
+        alignItems: "center",
+      }}
+    >
+      <h1>404 Not found</h1>
+      <p>The page you requested was not found!</p>
+      <RouterLink to="/">
+        <Button>Go back home</Button>
+      </RouterLink>
+    </div>
+  );
+}

matrixgw_frontend/src/routes/auth/LoginRoute.tsx

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+export function LoginRoute(): React.ReactElement {
+  return <>LoginRoute</>;
+}

matrixgw_frontend/src/routes/auth/OIDCCbRoute.tsx

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+import { CircularProgress } from "@mui/material";
+import { useEffect, useRef, useState } from "react";
+import { useNavigate, useSearchParams } from "react-router";
+import { AuthApi } from "../../api/AuthApi";
+import { useAuth } from "../../App";
+import { AuthSingleMessage } from "../../widgets/auth/AuthSingleMessage";
+
+/**
+ * OpenID login callback route
+ */
+export function OIDCCbRoute(): React.ReactElement {
+  const auth = useAuth();
+  const navigate = useNavigate();
+
+  const [error, setError] = useState(false);
+
+  const [searchParams] = useSearchParams();
+  const code = searchParams.get("code");
+  const state = searchParams.get("state");
+
+  const count = useRef("");
+
+  useEffect(() => {
+    const load = async () => {
+      try {
+        if (count.current === code) {
+          return;
+        }
+        count.current = code!;
+
+        await AuthApi.FinishOpenIDLogin(code!, state!);
+        navigate("/");
+        auth.setSignedIn(true);
+      } catch (e) {
+        console.error(e);
+        setError(true);
+      }
+    };
+
+    load();
+  });
+
+  if (error)
+    return (
+      <AuthSingleMessage message="Failed to finalize OpenID authentication!" />
+    );
+
+  return (
+    <>
+      <CircularProgress />
+    </>
+  );
+}