Add RRuleDisplay component and clean up unused imports

- Create new RRuleDisplay component for better recurrence rule formatting
- Replace Badge with RRuleDisplay in EventCard for improved UX
- Remove unused imports across multiple files (CalendarEvent, Badge, Card components)
- Remove unused catch parameter in ai-event route

src/app/api/ai-event/route.ts

@@ -60,7 +60,7 @@ Rules:
 		const content = data.choices[0].message.content;
 		const parsed = JSON.parse(content);
 		return NextResponse.json(parsed);
-	} catch (e) {
+	} catch {
 		return NextResponse.json(
 			{ error: "Failed to parse AI output", raw: data },
 			{ status: 500 },