fix: handle PathBuf correctly

src/command/dispatch.rs

@@ -1,3 +1,5 @@
+use std::path::PathBuf;
+
 use super::types::{CellValueArg, Command, CommandResult};
 use crate::formula::parse_formula;
 use crate::import::analyzer::{analyze_records, extract_array_at_path, FieldKind};
@@ -169,11 +171,11 @@ pub fn dispatch(model: &mut Model, cmd: &Command) -> CommandResult {
 
 fn import_headless(
     model: &mut Model,
-    path: &str,
+    path: &PathBuf,
     model_name: Option<&str>,
     array_path: Option<&str>,
 ) -> CommandResult {
-    let is_csv = path.ends_with(".csv");
+    let is_csv = path.extension().is_some_and(|ext| ext.eq_ignore_ascii_case("csv"));
 
     let records = if is_csv {
         // Parse CSV file
@@ -185,7 +187,7 @@ fn import_headless(
         // Parse JSON file
         let content = match std::fs::read_to_string(path) {
             Ok(c) => c,
-            Err(e) => return CommandResult::err(format!("Cannot read '{path}': {e}")),
+            Err(e) => return CommandResult::err(format!("Cannot read '{}': {e}", path.display())),
         };
         let value: serde_json::Value = match serde_json::from_str(&content) {
             Ok(v) => v,

src/command/types.rs

@@ -1,3 +1,5 @@
+use std::path::PathBuf;
+
 use crate::view::Axis;
 use serde::{Deserialize, Serialize};
 
@@ -80,7 +82,7 @@ pub enum Command {
 
     /// Import a JSON file via the analyzer (non-interactive, uses auto-detected proposals).
     ImportJson {
-        path: String,
+        path: PathBuf,
         model_name: Option<String>,
         /// Dot-path to the records array (empty = root)
         array_path: Option<String>,