Display email delivery statistics

[jkbcz]

1. Adds UI for displaying delivery statistics when sending out an email
2. The new UI is only enabled for new emails, because we didn't store the notification id, so it's impossible to fetch statistics for older notifications.

[Copilot]

Pull request overview

This PR adds support for displaying (and manually refreshing) email delivery statistics for sent notifications in the bcc-login editor UI by persisting the CoreAPI notification id + delivery stats in post meta and exposing a REST endpoint to refresh stats.

Changes:

• Persist notification id, type, and delivery statistics in sent_notifications meta when sending notifications.
• Add a REST endpoint to refresh delivery statistics by fetching the notification from CoreAPI and updating stored meta.
• Replace the “sent notifications” UI from a simple table to a per-notification summary + delivery statistics section with a refresh action and toast feedback.

Reviewed changes

Copilot reviewed 6 out of 7 changed files in this pull request and generated 13 comments.

Show a summary per file

File	Description
yarn.lock	Updates/locks dependencies pulled in by the UI + tooling changes.
plugins/bcc-login/src/visibility.js	Stops pre-formatting sent_notifications and passes raw meta through to the list component.
plugins/bcc-login/src/components/sent-notifications-list.js	New UI for listing sent notifications and showing/refreshing delivery statistics.
plugins/bcc-login/src/components/send-notifications.js	Dispatches an updated notifications payload after sending.
plugins/bcc-login/includes/class-bcc-notifications.php	REST endpoints now return updated notifications; adds refresh-statistics endpoint; stores delivery stats.
plugins/bcc-login/includes/class-bcc-login-visibility.php	Extends REST meta schema for sent_notifications (adds id/type/stats); removes sanitize callback.
plugins/bcc-login/includes/class-bcc-coreapi-client.php	send_notification() returns decoded JSON; adds get_notification() helper.

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