v0.0.9

fix(topbar): clear/replace the selected cluster when it's been removed

The top bar only auto-selected when nothing was chosen, so a deleted cluster
stayed selected and kept sending a stale X-Cluster-ID (API 400). Now, after a
successful cluster-list load, reconcile the selection: none → first; removed →
first available, or clear if none remain. Skips reconciliation on load error so
transient failures don't wipe a valid choice.

Co-Authored-By: Claude Opus 4.8 (1M context) noreply@anthropic.com

Full Changelog: v0.0.8...v0.0.9