build(snap): adopt appstream metadata

pkg/snap/snapcraft.yaml

@@ -2,17 +2,9 @@
 name: zeal
 base: core24
 adopt-info: zeal
-summary: Offline documentation browser
-description: |
-  Zeal is a simple offline documentation browser inspired by Dash.
-  It offers access to over 200 docsets covering various APIs and libraries.
-title: Zeal
-license: GPL-3.0-or-later
-contact: https://go.zealdocs.org/l/contact
-issues: https://github.com/zealdocs/zeal/issues
-source-code: https://github.com/zealdocs/zeal
-website: https://zealdocs.org
-icon: assets/freedesktop/128-apps-zeal.png
+contact:
+  - https://go.zealdocs.org/l/contact
+  - support@zealdocs.org
 grade: stable
 confinement: strict
 
@@ -30,6 +22,7 @@ lint:
 apps:
   zeal:
     command: usr/bin/zeal
+    common-id: org.zealdocs.zeal
     extensions: [kde-neon-6]
     plugs:
       - home
@@ -44,6 +37,8 @@ parts:
   zeal:
     plugin: cmake
     source: .
+    parse-info:
+      - usr/share/metainfo/org.zealdocs.zeal.appdata.xml
     cmake-parameters:
       - -DCMAKE_INSTALL_PREFIX=/usr
       - -DCMAKE_BUILD_TYPE=Release