Make Traffic rows easier to read and open their messages

[santoshkumarradha]

Problem

Traffic rows should show how old a message is and let the person open that message by pressing the row. The sender handle and thread disclosure must keep their separate actions. Older rows should retain short relative ages rather than switching to a calendar date. Related reminder labels should use the same middle-dot separator consistently.

This tracks the narrow changes proposed in #1500 and #1503, independently of their older team-feature branch history.

Acceptance

• In a real manager/member workflow, pressing a Traffic row opens its owning conversation at the associated message. Pressing a handle opens that member, while pressing the disclosure opens the thread. Same-conversation navigation works too.
• Navigation reveals the target when its activity group is collapsed; it does not silently land on an invisible message.
• Narrow layouts preserve sender, recipient and thread controls; message wording yields space to a compact age. Missing timestamps render nothing.
• Deterministic date fixtures cover minutes, hours, days, weeks and years, including boundaries and future timestamps. A live workflow verifies current ages and resizing.
• One-time reminder wording and its approval label use the middle dot consistently. Record the actual terminal workflow and independently use its resulting artifact.

Related but separate: #1524 concerns missing Traffic events, and #1552 concerns Teams keyboard focus. This issue does not claim to resolve either.