fix(rust): warn when browse --depth ignored, extract page-size const, tidy clones

Warn on stderr when --parent-gobject-id and --depth>0 are both supplied
since depth is silently ignored in the single-level parent path. Also
updates the --depth arg doc to document this. Extracts BROWSE_PAGE_SIZE
const (500) with a cross-reference to galaxy.rs instead of a bare literal.
Removes three redundant .clone() calls in BrowseChildrenOptions construction
since the originals are not used after the struct is built.

clients/rust/crates/mxgw-cli/src/main.rs

@@ -423,6 +423,7 @@ enum GalaxyCommand {
         historized_only: bool,
         /// Number of additional levels to eagerly expand beneath each returned
         /// node. 0 (the default) prints only the requested level.
+        /// Ignored when --parent-gobject-id is specified.
         #[arg(long, default_value_t = 0)]
         depth: usize,
         #[arg(long)]
@@ -1156,11 +1157,15 @@ async fn run_galaxy(command: GalaxyCommand) -> Result<(), Error> {
             depth,
             json,
         } => {
+            if parent_gobject_id.is_some() && depth > 0 {
+                eprintln!("warning: --depth is ignored when --parent-gobject-id is specified");
+            }
+
             let mut client = connect_galaxy(connection).await?;
             let options = BrowseChildrenOptions {
-                category_ids: category_ids.clone(),
-                template_chain_contains: template_chain_contains.clone(),
-                tag_name_glob: tag_name_glob.clone(),
+                category_ids,
+                template_chain_contains,
+                tag_name_glob,
                 include_attributes: include_attributes.then_some(true),
                 alarm_bearing_only,
                 historized_only,
@@ -1201,6 +1206,11 @@ async fn run_galaxy(command: GalaxyCommand) -> Result<(), Error> {
     Ok(())
 }
 
+/// Page size used for the raw `BrowseChildren` RPC when fetching a single
+/// level via `--parent-gobject-id`. Mirrors `BROWSE_CHILDREN_PAGE_SIZE` in
+/// `galaxy.rs` (the library's lazy-browse helper uses the same value).
+const BROWSE_PAGE_SIZE: i32 = 500;
+
 /// Drive `BrowseChildren` paging by hand for a single parent and return the
 /// flattened child list. Used by the `browse --parent-gobject-id` path, which
 /// surfaces one level of children rather than the lazy root-tree walk.
@@ -1219,7 +1229,7 @@ async fn browse_children_one_level(
     let mut seen: HashSet<String> = HashSet::new();
     loop {
         let request = BrowseChildrenRequest {
-            page_size: 500,
+            page_size: BROWSE_PAGE_SIZE,
             page_token: page_token.clone(),
             category_ids: options.category_ids.clone(),
             template_chain_contains: options.template_chain_contains.clone(),