Add right-click context menu to external calendars for deletion

Users can now right-click on external calendar items in the sidebar
to access a context menu with a "Delete Calendar" option. The delete
action removes the calendar from both the server and local state,
including all associated events from the calendar display.

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

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

frontend/src/app.rs

@@ -1029,6 +1029,39 @@ pub fn App() -> Html {
                                             });
                                         }
                                     })}
+                                    on_external_calendar_delete={Callback::from({
+                                        let external_calendars = external_calendars.clone();
+                                        let external_calendar_events = external_calendar_events.clone();
+                                        move |id: i32| {
+                                            let external_calendars = external_calendars.clone();
+                                            let external_calendar_events = external_calendar_events.clone();
+                                            wasm_bindgen_futures::spawn_local(async move {
+                                                // Delete the external calendar from the server
+                                                if let Err(err) = CalendarService::delete_external_calendar(id).await {
+                                                    web_sys::console::log_1(
+                                                        &format!("Failed to delete external calendar: {}", err).into(),
+                                                    );
+                                                    return;
+                                                }
+                                                
+                                                // Remove calendar from local state
+                                                let mut calendars = (*external_calendars).clone();
+                                                calendars.retain(|c| c.id != id);
+                                                external_calendars.set(calendars.clone());
+                                                
+                                                // Remove events from this calendar
+                                                let mut events = (*external_calendar_events).clone();
+                                                events.retain(|e| {
+                                                    if let Some(ref calendar_path) = e.calendar_path {
+                                                        calendar_path != &format!("external_{}", id)
+                                                    } else {
+                                                        true
+                                                    }
+                                                });
+                                                external_calendar_events.set(events);
+                                            });
+                                        }
+                                    })}
                                     color_picker_open={(*color_picker_open).clone()}
                                     on_color_change={on_color_change}
                                     on_color_picker_toggle={on_color_picker_toggle}

frontend/src/components/sidebar.rs

@@ -104,6 +104,7 @@ pub struct SidebarProps {
     pub on_create_external_calendar: Callback<()>,
     pub external_calendars: Vec<ExternalCalendar>,
     pub on_external_calendar_toggle: Callback<i32>,
+    pub on_external_calendar_delete: Callback<i32>,
     pub color_picker_open: Option<String>,
     pub on_color_change: Callback<(String, String)>,
     pub on_color_picker_toggle: Callback<String>,
@@ -119,6 +120,7 @@ pub struct SidebarProps {
 
 #[function_component(Sidebar)]
 pub fn sidebar(props: &SidebarProps) -> Html {
+    let external_context_menu_open = use_state(|| None::<i32>);
     let on_view_change = {
         let on_view_change = props.on_view_change.clone();
         Callback::from(move |e: Event| {
@@ -158,6 +160,30 @@ pub fn sidebar(props: &SidebarProps) -> Html {
         })
     };
 
+    let on_external_calendar_context_menu = {
+        let external_context_menu_open = external_context_menu_open.clone();
+        Callback::from(move |(e, cal_id): (MouseEvent, i32)| {
+            e.prevent_default();
+            external_context_menu_open.set(Some(cal_id));
+        })
+    };
+
+    let on_external_calendar_delete = {
+        let on_external_calendar_delete = props.on_external_calendar_delete.clone();
+        let external_context_menu_open = external_context_menu_open.clone();
+        Callback::from(move |cal_id: i32| {
+            on_external_calendar_delete.emit(cal_id);
+            external_context_menu_open.set(None);
+        })
+    };
+
+    let close_external_context_menu = {
+        let external_context_menu_open = external_context_menu_open.clone();
+        Callback::from(move |_| {
+            external_context_menu_open.set(None);
+        })
+    };
+
     html! {
         <aside class="app-sidebar">
             <div class="sidebar-header">
@@ -228,8 +254,17 @@ pub fn sidebar(props: &SidebarProps) -> Html {
                                         };
                                         
                                         html! {
-                                            <li class="external-calendar-item">
+                                            <li class="external-calendar-item" style="position: relative;">
-                                                <div class="external-calendar-info">
+                                                <div 
+                                                    class="external-calendar-info"
+                                                    oncontextmenu={{
+                                                        let on_context_menu = on_external_calendar_context_menu.clone();
+                                                        let cal_id = cal.id;
+                                                        Callback::from(move |e: MouseEvent| {
+                                                            on_context_menu.emit((e, cal_id));
+                                                        })
+                                                    }}
+                                                >
                                                     <input
                                                         type="checkbox"
                                                         checked={cal.is_visible}
@@ -242,6 +277,36 @@ pub fn sidebar(props: &SidebarProps) -> Html {
                                                     <span class="external-calendar-name">{&cal.name}</span>
                                                     <span class="external-calendar-indicator">{"📅"}</span>
                                                 </div>
+                                                {
+                                                    if *external_context_menu_open == Some(cal.id) {
+                                                        html! {
+                                                            <>
+                                                                <div 
+                                                                    class="context-menu-overlay" 
+                                                                    onclick={close_external_context_menu.clone()}
+                                                                    style="position: fixed; top: 0; left: 0; width: 100vw; height: 100vh; z-index: 999;"
+                                                                />
+                                                                <div class="context-menu" style="position: absolute; top: 0; right: 0; background: white; border: 1px solid #ccc; border-radius: 4px; box-shadow: 0 2px 8px rgba(0,0,0,0.15); z-index: 1000; min-width: 120px;">
+                                                                    <div 
+                                                                        class="context-menu-item" 
+                                                                        style="padding: 8px 12px; cursor: pointer; color: #d73a49;"
+                                                                        onclick={{
+                                                                            let on_delete = on_external_calendar_delete.clone();
+                                                                            let cal_id = cal.id;
+                                                                            Callback::from(move |_| {
+                                                                                on_delete.emit(cal_id);
+                                                                            })
+                                                                        }}
+                                                                    >
+                                                                        {"Delete Calendar"}
+                                                                    </div>
+                                                                </div>
+                                                            </>
+                                                        }
+                                                    } else {
+                                                        html! {}
+                                                    }
+                                                }
                                             </li>
                                         }
                                     }).collect::<Html>()