fix: refresh PR state when branches gain a PR number

[matt2e]

Summary

• refresh PR status immediately after persisting a newly created PR number
• trigger an immediate status refresh when a branch hydrates with a PR number after mount
• avoid missing PR state updates for PR-backed branch creation flows

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Do not block PR completion on status refresh

handlePrCompletion now waits for commands.refreshPrStatus(branchId) before marking the PR as created, but that backend call can take up to 60 seconds (the gh wrapper enforces a 60s timeout). Because handleSessionEnd awaits this function before running prStateStore.clearSessionTracking, sessionRegistry.unregister, and drainQueuedSessions, a slow GitHub response can leave the branch stuck in "creating" and delay queued work even though the PR was already created. This refresh should be non-blocking (or moved after cleanup) so completion state is not held behind network latency.

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