Implement drag-to-move functionality for events in week view with CalDAV server integration

- Add drag-to-move event handlers to existing events in week view
- Extend drag state management to support both create and move operations
- Implement visual feedback with event preview during drag and hidden original
- Calculate new start/end times while preserving event duration
- Add CalDAV server update integration via calendar service
- Wire event update callbacks through component hierarchy (WeekView → Calendar → RouteHandler → App)
- Preserve all original event properties (title, description, location, reminders, etc.)
- Handle timezone conversion from local to UTC for server storage
- Add error handling with user feedback and success confirmation
- Include moving event CSS styling with enhanced visual feedback

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

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

src/components/route_handler.rs

@@ -27,6 +27,8 @@ pub struct RouteHandlerProps {
     #[prop_or_default]
     pub on_create_event_request: Option<Callback<crate::components::EventCreationData>>,
     #[prop_or_default]
+    pub on_event_update_request: Option<Callback<(CalendarEvent, chrono::NaiveDateTime, chrono::NaiveDateTime)>>,
+    #[prop_or_default]
     pub context_menus_open: bool,
 }
 
@@ -39,6 +41,7 @@ pub fn route_handler(props: &RouteHandlerProps) -> Html {
     let on_calendar_context_menu = props.on_calendar_context_menu.clone();
     let view = props.view.clone();
     let on_create_event_request = props.on_create_event_request.clone();
+    let on_event_update_request = props.on_event_update_request.clone();
     let context_menus_open = props.context_menus_open;
     
     html! {
@@ -50,6 +53,7 @@ pub fn route_handler(props: &RouteHandlerProps) -> Html {
             let on_calendar_context_menu = on_calendar_context_menu.clone();
             let view = view.clone();
             let on_create_event_request = on_create_event_request.clone();
+            let on_event_update_request = on_event_update_request.clone();
             let context_menus_open = context_menus_open;
             
             match route {
@@ -76,6 +80,7 @@ pub fn route_handler(props: &RouteHandlerProps) -> Html {
                                 on_calendar_context_menu={on_calendar_context_menu}
                                 view={view}
                                 on_create_event_request={on_create_event_request}
+                                on_event_update_request={on_event_update_request}
                                 context_menus_open={context_menus_open}
                             /> 
                         }
@@ -100,6 +105,8 @@ pub struct CalendarViewProps {
     #[prop_or_default]
     pub on_create_event_request: Option<Callback<crate::components::EventCreationData>>,
     #[prop_or_default]
+    pub on_event_update_request: Option<Callback<(CalendarEvent, chrono::NaiveDateTime, chrono::NaiveDateTime)>>,
+    #[prop_or_default]
     pub context_menus_open: bool,
 }
 
@@ -261,6 +268,7 @@ pub fn calendar_view(props: &CalendarViewProps) -> Html {
                                 on_calendar_context_menu={props.on_calendar_context_menu.clone()}
                                 view={props.view.clone()}
                                 on_create_event_request={props.on_create_event_request.clone()}
+                                on_event_update_request={props.on_event_update_request.clone()}
                                 context_menus_open={props.context_menus_open}
                             />
                         </div>
@@ -276,6 +284,7 @@ pub fn calendar_view(props: &CalendarViewProps) -> Html {
                             on_calendar_context_menu={props.on_calendar_context_menu.clone()}
                             view={props.view.clone()}
                             on_create_event_request={props.on_create_event_request.clone()}
+                            on_event_update_request={props.on_event_update_request.clone()}
                             context_menus_open={props.context_menus_open}
                         />
                     }