Add support for draft/account-registration

A new UI to register and verify accounts is added.

components/verify-form.js

@@ -0,0 +1,43 @@
+import { html, Component } from "../lib/index.js";
+import linkify from "../lib/linkify.js";
+
+export default class RegisterForm extends Component {
+	state = {
+		code: "",
+	};
+
+	constructor(props) {
+		super(props);
+
+		this.handleChange = this.handleChange.bind(this);
+		this.handleSubmit = this.handleSubmit.bind(this);
+	}
+
+	handleChange(event) {
+		let target = event.target;
+		let value = target.type == "checkbox" ? target.checked : target.value;
+		this.setState({ [target.name]: value });
+	}
+
+	handleSubmit(event) {
+		event.preventDefault();
+
+		this.props.onSubmit(this.state.code);
+	}
+
+	render() {
+		return html`
+			<form onChange=${this.handleChange} onSubmit=${this.handleSubmit}>
+				<p>Your account <strong>${this.props.account}</strong> has been created, but a verification code is required to complete the registration:<br/>${linkify(this.props.message)}</p>
+
+				<label>
+					Verification code:<br/>
+					<input type="text" name="code" value=${this.state.code} required autofocus autocomplete="off"/>
+				</label>
+				<br/><br/>
+
+				<button>Verify account</button>
+			</form>
+		`;
+	}
+}