Add Marketplace keywords and Data Science category; bump to 1.2.7

Add search keywords (simulink, slx, sldd, matlab, data dictionary) so the
extension is discoverable by file type and product, and add the Data Science
category alongside Visualization. Metadata only.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: ww-mw

package-lock.json

@@ -2,7 +2,7 @@
   "name": "simulink-data-explorer",
   "displayName": "Simulink Data Explorer",
   "description": "Explore Simulink models, data dictionaries, MAT-files, and projects as interactive tables and relationship trees.",
-  "version": "1.2.6",
+  "version": "1.2.7",
   "publisher": "mathworks",
   "icon": "media/icon.png",
   "private": true,
@@ -15,7 +15,15 @@
     "vscode": "^1.90.0"
   },
   "categories": [
-    "Visualization"
+    "Visualization",
+    "Data Science"
+  ],
+  "keywords": [
+    "simulink",
+    "slx",
+    "sldd",
+    "matlab",
+    "data dictionary"
   ],
   "main": "./dist/extension.js",
   "browser": "./dist/web/extension.js",