fix: resolve clippy warnings and test errors

- Implement FromStr trait for NodeType instead of custom from_str method
- Fix redundant_closure warning in server.rs:455
- Add #[allow(clippy::too_many_arguments)] for new_file_node
- Fix unused variables in tests (_user_id, _conn)
- Remove unused imports (NodeType, serde_json::json)
- Replace len() > 0 with !is_empty() for clarity
- Replace == false with negation operator
- Format code with cargo fmt

src/server.rs

@@ -7,6 +7,7 @@ use axum::{
     Router,
 };
 use serde::Deserialize;
+use std::str::FromStr;
 use std::sync::{Arc, Mutex};
 
 use crate::audio;
@@ -452,7 +453,9 @@ async fn create_node(
         let parent_id = body["parent_id"].as_str().map(|s| s.to_string());
         let node_type = body["node_type"]
             .as_str()
-            .map(|s| filetree::node::NodeType::from_str(s))
+            .map(|s| {
+                filetree::node::NodeType::from_str(s).unwrap_or(filetree::node::NodeType::Folder)
+            })
             .unwrap_or(filetree::node::NodeType::Folder);
 
         let node = match node_type {