change default h3-resoltion value

Author: mplmihir

hexfeed-backend/src/main/java/com/hexfeed/model/entity/Post.java

@@ -197,7 +197,7 @@ public class Post {
     @Min(value = 0, message = "H3 resolution must be non-negative")
     @Max(value = 15, message = "H3 resolution must be at most 15")
     @Builder.Default
-    private Integer h3Resolution = 7;
+    private Integer h3Resolution = 8;
 
     /**
      * Timestamp when the post was created

hexfeed-backend/src/main/java/com/hexfeed/service/CommentService.java

@@ -88,7 +88,7 @@ public CommentResponse addComment(UUID userId, UUID postId, CommentRequest reque
         metadata.put("parent_post_id", postId.toString());
 
         // Use parent post's h3_resolution if available, otherwise default to 7
-        Integer h3Resolution = post.getH3Resolution() != null ? post.getH3Resolution() : 7;
+        Integer h3Resolution = post.getH3Resolution() != null ? post.getH3Resolution() : 8;
 
         Post comment = Post.builder()
                 .hexId(hexId)