style(clippy): auto-fix code style issues and unnecessary map_or allocations detected by cargo clippy

server/src/handlers/meta.rs

@@ -274,10 +274,9 @@ impl McpTool for ReadPreferencesHandler {
     }
 
     async fn execute(&self, _args: Value, state: Arc<MemoryState>) -> Result<String, String> {
-        let data = state
+        state
             .prefs
-            .read_with(|prefs| serde_json::to_string(prefs).map_err(|e| e.to_string()));
-        data
+            .read_with(|prefs| serde_json::to_string(prefs).map_err(|e| e.to_string()))
     }
 }