Set the app copyright string for the macOS About window.

Co-authored-by: Cursor <cursoragent@cursor.com>

gramora.xcodeproj/project.pbxproj

@@ -260,7 +260,7 @@
 				INFOPLIST_KEY_CFBundleDisplayName = "Grammar Pro: AI Writing App";
 				INFOPLIST_KEY_CFBundleName = "Grammar Pro";
 				INFOPLIST_KEY_LSApplicationCategoryType = "public.app-category.education";
-				INFOPLIST_KEY_NSHumanReadableCopyright = "";
+				INFOPLIST_KEY_NSHumanReadableCopyright = "Copyright © 2026 Grammar Pro. All rights reserved.";
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/../Frameworks",
@@ -295,7 +295,7 @@
 				INFOPLIST_KEY_CFBundleDisplayName = "Grammar Pro: AI Writing App";
 				INFOPLIST_KEY_CFBundleName = "Grammar Pro";
 				INFOPLIST_KEY_LSApplicationCategoryType = "public.app-category.education";
-				INFOPLIST_KEY_NSHumanReadableCopyright = "";
+				INFOPLIST_KEY_NSHumanReadableCopyright = "Copyright © 2026 Grammar Pro. All rights reserved.";
 				LD_RUNPATH_SEARCH_PATHS = (
 					"$(inherited)",
 					"@executable_path/../Frameworks",