fix: check camelCase and snake_case for announcement push campaign ID

[dylanjeffers]

Summary

• extractNotificationCampaignIdFromPayload in packages/mobile/src/notifications.ts only checked for notification_campaign_id (snake_case), but the AnnouncementPushNotification type uses notificationCampaignId (camelCase) — so announcement push campaign clicks were never tracked
• Same fix applied to readNotificationCampaignId in packages/web/public/scripts/sw.js

Both extractors now check for both key forms so neither mobile nor web silently drops campaign IDs from announcement notifications.

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