fix: Use incremental ID

heromodels/src/models/calendar/calendar.rs

@@ -139,14 +139,13 @@ pub struct Calendar {
 }
 
 impl Calendar {
-    /// Creates a new calendar
+    /// Creates a new calendar with auto-generated ID
     ///
     /// # Arguments
-    /// * `id` - Optional ID for the calendar. If None, the ID will be auto-generated.
     /// * `name` - Name of the calendar
-    pub fn new(id: Option<u32>, name: impl ToString) -> Self {
+    pub fn new(name: impl ToString) -> Self {
         Self {
-            base_data: BaseModelData::new(id),
+            base_data: BaseModelData::new(),
             name: name.to_string(),
             description: None,
             events: Vec::new(),