Add mention support

Allow vertical resizing of inputs

reminder-dashboard/src/components/Reminder/Embed/Author.tsx

@@ -1,5 +1,7 @@
 import { ImagePicker } from "../ImagePicker";
 import { Reminder } from "../../../api";
+import { useMentions } from "../../App/useMentions";
+import { useRef } from "preact/hooks";
 
 type Props = {
     name: string;
@@ -8,6 +10,9 @@ type Props = {
 };
 
 export const Author = ({ name, icon, setReminder }: Props) => {
+    const input = useRef(null);
+    useMentions(input);
+
     return (
         <div class="embed-author-box">
             <div class="a">
@@ -34,6 +39,7 @@ export const Author = ({ name, icon, setReminder }: Props) => {
                     class="discord-embed-author message-input autoresize"
                     placeholder="Embed Author..."
                     rows={1}
+                    ref={input}
                     maxlength={256}
                     name="embed_author"
                     value={name}