implement third-party app launching from home screen

src/main/assets/apps/home/home.lua

@@ -132,6 +132,16 @@ function renderThirdPartyApps()
     print("[Home] Rendered " .. #installed_apps .. " third-party apps")
 end
 
+-- Get app info by package_id
+function getAppInfo(package_id)
+    for _, app in ipairs(installed_apps) do
+        if app.package_id == package_id then
+            return app
+        end
+    end
+    return nil
+end
+
 -- Launch a third-party app
 function launchThirdPartyApp(package_id)
     print("[Home] Launching app: " .. package_id)
@@ -139,7 +149,22 @@ function launchThirdPartyApp(package_id)
     if mosis and mosis.apps then
         local success = mosis.apps.launch(package_id)
         if success then
-            print("[Home] App launched: " .. package_id)
+            print("[Home] App sandbox started: " .. package_id)
+
+            -- Now load the app's UI document
+            local app_info = getAppInfo(package_id)
+            if app_info and app_info.install_path and app_info.entry_point then
+                local entry_path = app_info.install_path .. "/" .. app_info.entry_point
+                print("[Home] Loading app screen: " .. entry_path)
+                local loaded = loadScreen(entry_path)
+                if loaded then
+                    print("[Home] App UI loaded: " .. package_id)
+                else
+                    print("[Home] Failed to load app UI: " .. entry_path)
+                end
+            else
+                print("[Home] App info missing entry point: " .. package_id)
+            end
         else
             print("[Home] Failed to launch app: " .. package_id)
         end