Add selection validation for direct commands in Core.js

Introduced a helper function to validate user selection before executing direct commands. This enhancement ensures that users are notified to select layers if none are currently selected, improving user experience and preventing unnecessary command execution.

Author: basiclines

src/Core.js

@@ -37,8 +37,24 @@ function hashLicenseKey(key) {
 	}
 }
 
+// Helper function to validate selection for direct commands
+function validateSelectionForCommand(commandName) {
+	const selection = figma.currentPage.selection
+	if (selection.length === 0) {
+		figma.notify('Select some layers first to start using Super Tidy.')
+		figma.closePlugin()
+		return false
+	}
+	return true
+}
+
 // Helper function to handle gating for direct menu commands
 function ensureDirectCommandGate(commandName, executeCommand, preferences, UUID, license) {
+	// First validate selection - skip everything if no selection
+	if (!validateSelectionForCommand(commandName)) {
+		return // Exit early, user already notified
+	}
+	
 	if (shouldShowCountdown()) {
 		// Show UI with countdown for unlicensed users
 		figma.showUI(__html__, { width: 360, height: UI_HEIGHT })