feat(appd): add version field to AppInfo; surface it in launcher tile tooltip

WappPackage and AppInfo both gain a version field. scan_installed_apps()
reads it from wapp.toml and includes it in InstalledApps responses.
system-ui.html shows it in the title tooltip as 'com.example.app v1.0.0'.
All roundtrip and integration tests updated.

crates/weft-appd/src/ipc.rs

@@ -21,6 +21,7 @@ pub struct SessionInfo {
 pub struct AppInfo {
     pub app_id: String,
     pub name: String,
+    pub version: String,
 }
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
@@ -142,11 +143,13 @@ mod tests {
         let info = super::AppInfo {
             app_id: "com.example.app".into(),
             name: "Example App".into(),
+            version: "1.2.3".into(),
         };
         let bytes = rmp_serde::to_vec(&info).unwrap();
         let decoded: super::AppInfo = rmp_serde::from_slice(&bytes).unwrap();
         assert_eq!(decoded.app_id, "com.example.app");
         assert_eq!(decoded.name, "Example App");
+        assert_eq!(decoded.version, "1.2.3");
     }
 
     #[test]
@@ -163,6 +166,7 @@ mod tests {
             apps: vec![super::AppInfo {
                 app_id: "com.example.app".into(),
                 name: "Example App".into(),
+                version: "0.9.0".into(),
             }],
         };
         let bytes = rmp_serde::to_vec(&resp).unwrap();
@@ -172,6 +176,7 @@ mod tests {
                 assert_eq!(apps.len(), 1);
                 assert_eq!(apps[0].app_id, "com.example.app");
                 assert_eq!(apps[0].name, "Example App");
+                assert_eq!(apps[0].version, "0.9.0");
             }
             _ => panic!("wrong variant"),
         }

crates/weft-appd/src/main.rs

@@ -292,6 +292,7 @@ fn app_store_roots() -> Vec<std::path::PathBuf> {
 struct WappPackage {
     id: String,
     name: String,
+    version: String,
 }
 
 #[derive(serde::Deserialize)]
@@ -318,6 +319,7 @@ fn scan_installed_apps() -> Vec<AppInfo> {
                 apps.push(AppInfo {
                     app_id: m.package.id,
                     name: m.package.name,
+                    version: m.package.version,
                 });
             }
         }
@@ -615,6 +617,7 @@ mod tests {
         assert_eq!(apps.len(), 1);
         assert_eq!(apps[0].app_id, "com.example.scanner");
         assert_eq!(apps[0].name, "Scanner");
+        assert_eq!(apps[0].version, "1.0.0");
 
         unsafe {
             match prior {

infra/shell/system-ui.html

@@ -319,7 +319,7 @@
         apps.forEach(function (app) {
           var icon = document.createElement('weft-app-icon');
           icon.dataset.appId = app.app_id;
-          icon.title = app.app_id;
+          icon.title = app.app_id + (app.version ? ' v' + app.version : '');
           icon.innerHTML =
             '<svg width="40" height="40" viewBox="0 0 40 40" fill="none"' +
             ' xmlns="http://www.w3.org/2000/svg" aria-hidden="true">' +