fix: picking a prompt from / in a channel inserts the prompt text (#32713)

src/lib/components/channel/MessageInput.svelte

@@ -711,6 +711,24 @@
 				: []),
 			{
 				char: '/',
+				command: ({ editor, range, props }) => {
+					if (props?.type === 'prompt') {
+						void insertTextAtCursor(props.content ?? '');
+						return;
+					}
+
+					editor
+						.chain()
+						.focus()
+						.insertContentAt(range, [
+							{
+								type: 'mention',
+								attrs: { ...props, mentionSuggestionChar: '/' }
+							},
+							{ type: 'text', text: ' ' }
+						])
+						.run();
+				},
 				render: getSuggestionRenderer(CommandSuggestionList, {
 					i18n,
 					onSelect: (e) => {