Reviewable WhatsApp updates view with quick actions and revisit history

Description: Currently the "WhatsApp updates" button routes straight to the main dashboard, so users can't review the batch of recent WhatsApp interactions (last interaction changes, chat snippets, new contacts) as a discrete list. Two specific asks:

1. A dedicated view/feed of recent WhatsApp updates where users can take action on each one (set a reminder, add a note, mark as followed up, snooze).

2. Ability to revisit previously seen updates rather than having them disappear once the dashboard loads.

User explicitly said they enjoy reviewing WhatsApp updates and would value either an "act on it" workflow or a "go back to it later" archive view. Related to the earlier "email digest of WhatsApp updates" idea but focused on in-app review and action-taking rather than email delivery.