fix(cli): use map_or_else when loading managed sessions

Resolves clippy::map_unwrap_or in main.rs.

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

rust/crates/rusty-claude-cli/src/main.rs

@@ -2058,7 +2058,17 @@ fn list_managed_sessions() -> Result<Vec<ManagedSessionSummary>, Box<dyn std::er
             .map(|duration| duration.as_secs())
             .unwrap_or_default();
         let (id, message_count, parent_session_id, branch_name) = Session::load_from_path(&path)
-            .map(|session| {
+            .map_or_else(|_| {
+                (
+                    path.file_stem()
+                        .and_then(|value| value.to_str())
+                        .unwrap_or("unknown")
+                        .to_string(),
+                    0,
+                    None,
+                    None,
+                )
+            }, |session| {
                 let parent_session_id = session
                     .fork
                     .as_ref()
@@ -2073,17 +2083,6 @@ fn list_managed_sessions() -> Result<Vec<ManagedSessionSummary>, Box<dyn std::er
                     parent_session_id,
                     branch_name,
                 )
-            })
-            .unwrap_or_else(|_| {
-                (
-                    path.file_stem()
-                        .and_then(|value| value.to_str())
-                        .unwrap_or("unknown")
-                        .to_string(),
-                    0,
-                    None,
-                    None,
-                )
             });
         sessions.push(ManagedSessionSummary {
             id,