Fix drag-to-create event bugs and improve week view UX

- Restrict drag-to-create to left-click only (ignore right-clicks)
- Prevent drag-to-create when clicking on existing events
- Remove unnecessary right-click context menu from week view empty spaces

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

src/components/week_view.rs

@@ -120,6 +120,11 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                 let onmousedown = {
                                     let drag_state = drag_state_clone.clone();
                                     Callback::from(move |e: MouseEvent| {
+                                        // Only handle left-click (button 0)
+                                        if e.button() != 0 {
+                                            return;
+                                        }
+                                        
                                         // Calculate Y position relative to day column container
                                         // Use layer_y which gives coordinates relative to positioned ancestor
                                         let relative_y = e.layer_y() as f64;
@@ -197,18 +202,6 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                 html! {
                                     <div 
                                         class={classes!("week-day-column", if is_today { Some("today") } else { None })}
-                                        oncontextmenu={
-                                            if let Some(callback) = &props.on_calendar_context_menu {
-                                                let callback = callback.clone();
-                                                let date = *date;
-                                                Some(Callback::from(move |e: web_sys::MouseEvent| {
-                                                    e.prevent_default();
-                                                    callback.emit((e, date));
-                                                }))
-                                            } else {
-                                                None
-                                            }
-                                        }
                                         {onmousedown}
                                         {onmousemove}
                                         {onmouseup}
@@ -250,6 +243,12 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                                         })
                                                     };
                                                     
+                                                    let onmousedown_event = {
+                                                        Callback::from(move |e: MouseEvent| {
+                                                            e.stop_propagation(); // Prevent drag-to-create from starting on event clicks
+                                                        })
+                                                    };
+                                                    
                                                     let oncontextmenu = {
                                                         if let Some(callback) = &props.on_event_context_menu {
                                                             let callback = callback.clone();
@@ -310,6 +309,7 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                                             )}
                                                             {onclick}
                                                             {oncontextmenu}
+                                                            onmousedown={onmousedown_event}
                                                         >
                                                             <div class="event-title">{event.summary.as_ref().unwrap_or(&"Untitled".to_string())}</div>
                                                             {if !is_all_day {