Improve Imports, Reporting, And Conversation Failure Visibility

Failed outbound messages in conversations are easier to spot with clearer delivery-failure styling in the timeline.

The subscriptions report now opens with the most commonly reviewed columns first, so less manual sorting and pinning is needed.

Portal.io and D-Tools imports are more reliable when duplicate or soft-deleted client records are involved, preventing import failures and parsing issues.

Signal email and SMS notifications now open the specific conversation directly instead of landing in a broader conversation view.

Newly created conversations now appear in the Associated Conversations sidebar right away without needing a manual refresh.

Scheduled Send Later emails now include attachments such as PDFs when they are delivered.