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/filetree/mod.rs

@@ -1,5 +1,6 @@
 use anyhow::{Context, Result};
 use rusqlite::Connection;
+use std::str::FromStr;
 use uuid::Uuid;
 
 use crate::filetree::node::{Aliases, FileNode, NodeType};
@@ -95,7 +96,8 @@ impl FileTree {
                     sha256: row.get(4)?,
                     parent_id: row.get(5)?,
                     children,
-                    node_type: NodeType::from_str(&row.get::<_, String>(7)?),
+                    node_type: NodeType::from_str(&row.get::<_, String>(7)?)
+                        .unwrap_or(NodeType::Folder),
                     icon: row.get(8)?,
                     color: row.get(9)?,
                     bg_color: row.get(10)?,
@@ -290,6 +292,7 @@ impl FileTree {
         }
     }
 
+    #[allow(clippy::too_many_arguments)]
     pub fn new_file_node(
         label: &str,
         file_uuid: &str,

src/filetree/node.rs

@@ -1,5 +1,6 @@
 use serde::{Deserialize, Serialize};
 use std::collections::HashMap;
+use std::str::FromStr;
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct FileNode {
@@ -72,13 +73,17 @@ impl NodeType {
             NodeType::DynamicLayer => "dynamic_layer",
         }
     }
+}
 
-    pub fn from_str(s: &str) -> Self {
+impl FromStr for NodeType {
+    type Err = String;
+
+    fn from_str(s: &str) -> Result<Self, Self::Err> {
         match s {
-            "folder" => NodeType::Folder,
-            "file" => NodeType::File,
-            "dynamic_layer" => NodeType::DynamicLayer,
-            _ => NodeType::Folder,
+            "folder" => Ok(NodeType::Folder),
+            "file" => Ok(NodeType::File),
+            "dynamic_layer" => Ok(NodeType::DynamicLayer),
+            _ => Ok(NodeType::Folder), // Default to Folder for unknown types
         }
     }
 }

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 {