refac: channel message input

src/lib/components/channel/MessageInput.svelte

@@ -243,7 +243,7 @@
 	};
 
 	const submitHandler = async () => {
-		if (content === '') {
+		if (content === '' && files.length === 0) {
 			return;
 		}
 
@@ -581,11 +581,11 @@
 										<Tooltip content={$i18n.t('Send message')}>
 											<button
 												id="send-message-button"
-												class="{content !== ''
+												class="{content !== '' || files.length !== 0
 													? 'bg-black text-white hover:bg-gray-900 dark:bg-white dark:text-black dark:hover:bg-gray-100 '
 													: 'text-white bg-gray-200 dark:text-gray-900 dark:bg-gray-700 disabled'} transition rounded-full p-1.5 self-center"
 												type="submit"
-												disabled={content === ''}
+												disabled={content === '' && files.length === 0}
 											>
 												<svg
 													xmlns="http://www.w3.org/2000/svg"