feat: add recurring event deletion with three modes

Implement three deletion modes for recurring events:
- single: exclude specific occurrence via EXDATE mechanism
- future: set RRULE UNTIL to stop future occurrences
- all: delete entire event series

Changes include:
- Add exceptionDates field to CalendarEvent model
- Add RecurringDeleteMode type and DeleteRecurringEventDTO
- EventService.deleteRecurring() with mode-based logic using rrule library
- EventController DELETE endpoint accepts mode/occurrenceDate query params
- recurrenceExpander filters out exception dates during expansion
- AI tools support deleteMode and occurrenceDate for proposed deletions
- ChatService.confirmEvent() handles recurring delete modes
- New DeleteEventModal component for unified delete confirmation UI
- Calendar screen integrates modal for both recurring and non-recurring events

apps/client/src/components/ChatBubble.tsx

@@ -10,7 +10,12 @@ type ChatBubbleProps = {
   style?: ViewStyle;
 };
 
-export function ChatBubble({ side, children, className = "", style }: ChatBubbleProps) {
+export function ChatBubble({
+  side,
+  children,
+  className = "",
+  style,
+}: ChatBubbleProps) {
   const { theme } = useThemeStore();
   const borderColor = side === "left" ? theme.chatBot : theme.primeFg;
   const sideClass =
@@ -21,7 +26,10 @@ export function ChatBubble({ side, children, className = "", style }: ChatBubble
   return (
     <View
       className={`border-2 border-solid rounded-xl my-2 ${sideClass} ${className}`}
-      style={[{ borderColor, elevation: 8, backgroundColor: theme.secondaryBg }, style]}
+      style={[
+        { borderColor, elevation: 8, backgroundColor: theme.secondaryBg },
+        style,
+      ]}
     >
       {children}
     </View>