Add Marketplace icon, banner and README screenshot

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>

package.json

@@ -5,6 +5,11 @@
   "version": "0.2.0",
   "publisher": "vscode-extensions",
   "license": "MIT",
+  "icon": "media/icon.png",
+  "galleryBanner": {
+    "color": "#0f172a",
+    "theme": "dark"
+  },
   "repository": {
     "type": "git",
     "url": "https://gitea.lego-cloud.eu/vscode-extensions/archify-vscode-ext.git"
@@ -53,7 +58,7 @@
       },
       {
         "command": "archify.renderToHtml",
-        "title": "Render to HTML File…",
+        "title": "Render to HTML File\u2026",
         "category": "Archify",
         "icon": "$(file-code)"
       },