fix: filter out doses from previous schedules in SharedSchedule (#88)

- Add updatedAt field to share API response
- Add isDoseFromPreviousSchedule check in SharedSchedule
- Don't count doses scheduled before medication update as missed
- Syncs SharedSchedule behavior with main app's AppContext logic

backend/src/routes/share.ts

@@ -119,6 +119,7 @@ export async function shareRoutes(app: FastifyInstance) {
 				takenBy: takenByArray,
 				blisters,
 				dismissedUntil: med.dismissedUntil,
+				updatedAt: med.updatedAt, // For filtering out doses from previous schedule configurations
 			};
 		});