Add context menus to all-day event boxes

All-day events now have the same right-click context menu functionality
as regular timed events, allowing users to edit, delete, and perform
other actions on all-day events.

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

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

frontend/src/components/week_view.rs

@@ -347,11 +347,26 @@ pub fn week_view(props: &WeekViewProps) -> Html {
                                                         })
                                                     };
                                                     
+                                                    let oncontextmenu = {
+                                                        if let Some(callback) = &props.on_event_context_menu {
+                                                            let callback = callback.clone();
+                                                            let event = (*event).clone();
+                                                            Some(Callback::from(move |e: web_sys::MouseEvent| {
+                                                                e.prevent_default();
+                                                                e.stop_propagation(); // Prevent calendar context menu from also triggering
+                                                                callback.emit((e, event.clone()));
+                                                            }))
+                                                        } else {
+                                                            None
+                                                        }
+                                                    };
+                                                    
                                                     html! {
                                                         <div 
                                                             class="all-day-event"
                                                             style={format!("background-color: {}", event_color)}
                                                             {onclick}
+                                                            {oncontextmenu}
                                                         >
                                                             <span class="all-day-event-title">
                                                                 {event.summary.as_ref().unwrap_or(&"Untitled".to_string())}