sessions: show remote name in session hovers

[Benjamin Christopher Simmonds (benibenj)]

Summary

• show the remote host name after the session title and session type/provider in Agents Window session hovers
• apply the same identity line to nested chat-row hovers for remote sessions
• preserve existing local-session hover text and avoid duplicate provider/remote labels when a disconnected provider has no session-type metadata
• add focused regression coverage for ordering, local sessions, and disconnected fallback behavior

Validation

Not run, per the requested rubber-duck-and-merge workflow. The change was reviewed with a rubber-duck pass before commit.

[Copilot]

Copilot review overview

🟢 Approval recommended

The focused implementation preserves existing behavior and includes appropriate regression coverage.

Review effort: Balanced
Findings: None

What changed in this PR

Adds remote host identity to Agents Window session and nested chat hovers while preserving local and disconnected fallback behavior.

Changes:

• Adds optional remote-host metadata to the shared hover widget.
• Derives provider and remote labels for session/chat hovers.
• Adds regression coverage for label ordering and fallback behavior.

File	Description
sessionSummaryHover.ts	Renders the remote host after the provider label.
sessionHoverContent.ts	Derives provider and remote-host hover metadata.
sessionsList.test.ts	Tests remote, local, and disconnected label behavior.

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