fix(test-app): ensure afterId parameter is always included in API requests

The /api/v2/report/plansLastUpdatedBetween endpoint requires the afterId
parameter. When no previous jwtId is stored, default to "0" for the first
request. This ensures afterId is always present and never null/omitted.

Fix resolves "afterId parameter is required" API errors. Verified working:
prefetch execution shows request body includes afterId: "0" and API returns
HTTP 200 successfully.

test-apps/daily-notification-test/android/app/src/main/java/com/timesafari/dailynotification/test/TestNativeFetcher.java

@@ -178,7 +178,14 @@ public class TestNativeFetcher implements NativeNotificationContentFetcher {
                 // Build request body
                 Map<String, Object> requestBody = new HashMap<>();
                 requestBody.put("planIds", getStarredPlanIds());
-                requestBody.put("afterId", getLastAcknowledgedJwtId());
+                
+                // afterId is required by the API endpoint
+                // Use "0" for first request (no previous data), or stored jwtId for subsequent requests
+                String afterId = getLastAcknowledgedJwtId();
+                if (afterId == null || afterId.isEmpty()) {
+                    afterId = "0"; // First request - start from beginning
+                }
+                requestBody.put("afterId", afterId);
                 
                 String jsonBody = gson.toJson(requestBody);
                 Log.d(TAG, "TestNativeFetcher: Request body: " + jsonBody);