feat: $ skills mention

src/lib/components/chat/MessageInput.svelte

@@ -390,7 +390,7 @@
 
 	let command = '';
 	export let showCommands = false;
-	$: showCommands = ['/', '#', '@'].includes(command?.charAt(0)) || '\\#' === command?.slice(0, 2);
+	$: showCommands = ['/', '#', '@', '$'].includes(command?.charAt(0)) || '\\#' === command?.slice(0, 2);
 	let suggestions = null;
 
 	let showTools = false;
@@ -946,6 +946,18 @@
 						}
 					}
 				})
+			},
+			{
+				char: '$',
+				render: getSuggestionRenderer(CommandSuggestionList, {
+					i18n,
+					onSelect: (e) => {
+						document.getElementById('chat-input')?.focus();
+					},
+
+					insertTextHandler: insertTextAtCursor,
+					onUpload: () => {}
+				})
 			}
 		];
 		loaded = true;