fix: complete rename of seen_paths to seen_names

Missed two references to seen_paths in scan_dir calls.
All references now correctly use seen_names for preset
name-based deduplication.

Author: kushiemoon

src-tauri/src/lib.rs

@@ -1470,7 +1470,7 @@ fn list_presets(dirs: Option<Vec<String>>) -> Result<Vec<PresetInfo>, String> {
     // Always search default directories first
     for dir_path in get_default_preset_dirs() {
         if dir_path.exists() && dir_path.is_dir() {
-            scan_dir(&dir_path, &mut presets, &mut seen_paths, 0);
+            scan_dir(&dir_path, &mut presets, &mut seen_names, 0);
         }
     }
 
@@ -1479,7 +1479,7 @@ fn list_presets(dirs: Option<Vec<String>>) -> Result<Vec<PresetInfo>, String> {
         for dir_str in custom_dirs {
             let dir_path = std::path::Path::new(&dir_str);
             if dir_path.exists() && dir_path.is_dir() {
-                scan_dir(dir_path, &mut presets, &mut seen_paths, 0);
+                scan_dir(dir_path, &mut presets, &mut seen_names, 0);
             }
         }
     }