enh: shortcode emojis

src/lib/components/chat/MessageInput.svelte

@@ -407,7 +407,7 @@
 	let command = '';
 	export let showCommands = false;
 	$: showCommands =
-		['/', '#', '@', '$'].includes(command?.charAt(0)) || '\\#' === command?.slice(0, 2);
+		['/', '#', '@', '$', ':'].includes(command?.charAt(0)) || '\\#' === command?.slice(0, 2);
 	let suggestions = null;
 
 	let showTools = false;
@@ -1030,6 +1030,25 @@
 						document.getElementById('chat-input')?.focus();
 					},
 
+					insertTextHandler: insertTextAtCursor,
+					onUpload: () => {}
+				})
+			},
+			{
+				char: ':',
+				allowSpaces: false,
+				command: ({ editor, range, props }) => {
+					// Convert the Unicode hex codepoint (e.g. "1F44B") to the actual emoji character (👋)
+					const codepoint = props.id;
+					const emoji = String.fromCodePoint(parseInt(codepoint, 16));
+					editor.chain().focus().deleteRange(range).insertContent(emoji).run();
+				},
+				render: getSuggestionRenderer(CommandSuggestionList, {
+					i18n,
+					onSelect: (e) => {
+						document.getElementById('chat-input')?.focus();
+					},
+
 					insertTextHandler: insertTextAtCursor,
 					onUpload: () => {}
 				})