fix(desktop): update desktop file and MetaInfo file (#14933)

Author: NN708

packages/desktop/src-tauri/release/appstream.metainfo.xml

@@ -28,11 +28,14 @@
 
   <screenshots>
     <screenshot type="default">
-      <image>https://opencode.ai/docs/_astro/screenshot.Bs5D4atL_ZvsvFu.webp</image>
+      <image>https://raw.githubusercontent.com/anomalyco/opencode/b75d4d1c5ec449585d515c756fc81f080a157a9a/packages/web/src/assets/lander/screenshot.png</image>
     </screenshot>
   </screenshots>
 
   <releases>
+    <release version="1.4.0" date="2026-04-08">
+      <url type="details">https://github.com/anomalyco/opencode/releases/tag/v1.4.0</url>
+    </release>
     <release version="1.0.223" date="2026-01-01">
       <url type="details">https://github.com/anomalyco/opencode/releases/tag/v1.0.223</url>
     </release>

packages/desktop/src-tauri/tauri.conf.json

@@ -32,6 +32,7 @@
       "icons/dev/icon.ico"
     ],
     "active": true,
+    "category": "DeveloperTool",
     "targets": ["deb", "rpm", "dmg", "nsis", "app"],
     "externalBin": ["sidecars/opencode-cli"],
     "linux": {