Add ui-theme-designer plugin (#3859)

.claude-plugin/marketplace.json

@@ -3263,6 +3263,22 @@
         }
       }
     },
+    {
+      "name": "ui-theme-designer",
+      "description": "Plugin for coding agents working with UI theme designer. Bundles two skills: how-to and conceptual answers about UI theme designer on BTP, and questions about the SAP Design System and SAP Fiori design tokens — theme parameters and component-level parameter usage in UI5, UI5 Web Components, and Fundamental Styles.",
+      "author": {
+        "name": "SAP SE"
+      },
+      "category": "design",
+      "source": {
+        "source": "git-subdir",
+        "url": "https://github.com/SAP/ui-theme-designer-plugins-for-coding-agents.git",
+        "path": "plugins/ui-theme-designer",
+        "ref": "main",
+        "sha": "c6ac4390403fa4ab2fa65f8b4001a03a19ee727c"
+      },
+      "homepage": "https://github.com/SAP/ui-theme-designer-plugins-for-coding-agents"
+    },
     {
       "name": "ui5",
       "description": "SAPUI5 / OpenUI5 plugin for coding agents. Create and validate UI5 projects, access API documentation, run UI5 linter, get development guidelines and best practices for UI5 development.",