Add webapp skeletons

matrixgw_frontend/src/widgets/BaseAuthenticatedPage.tsx

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+export function BaseAuthenticatedPage(): React.ReactElement {
+  return <p>todo authenticated</p>;
+}

matrixgw_frontend/src/widgets/RouterLink.tsx

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+import { type PropsWithChildren } from "react";
+import { Link } from "react-router";
+
+export function RouterLink(
+  p: PropsWithChildren<{ to: string; target?: React.HTMLAttributeAnchorTarget }>
+): React.ReactElement {
+  return (
+    <Link
+      to={p.to}
+      target={p.target}
+      style={{ color: "inherit", textDecoration: "inherit" }}
+    >
+      {p.children}
+    </Link>
+  );
+}

matrixgw_frontend/src/widgets/auth/AuthSingleMessage.tsx

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+import { Button } from "@mui/material";
+import { Link } from "react-router";
+
+export function AuthSingleMessage(p: { message: string }): React.ReactElement {
+  return (
+    <>
+      <p style={{ textAlign: "center" }}>{p.message}</p>
+      <Link to={"/"}>
+        <Button>Go back home</Button>
+      </Link>
+    </>
+  );
+}

matrixgw_frontend/src/widgets/auth/BaseLoginPage.tsx

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+export function BaseLoginPage(): React.ReactElement {
+  return <p>Todo login page route</p>;
+}