More cursor fixes

[khisakuni]

What was changed

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• Additional fixes for issues that cursor bug bot flagged in Develop #9
• Also updates the go version to 1.25.5 to fix the failed github actions workflow: https://github.com/temporalio/cloud-cli/actions/runs/22156432066/job/64061500337?pr=9

Checklist

1. Closes

2. How was this tested:

• running integration test locally and in CI

3. Any docs updates needed?

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Note

Low Risk
Small, localized changes to CLI lifecycle and OAuth flow error handling; low risk but could affect command timeout cancellation timing and login callback startup behavior.

Overview
Updates the Go toolchain version to 1.25.5 in go.mod and mise.toml.

Fixes a potential resource leak by storing and invoking the context.WithTimeoutCause cancel func created for --command-timeout during PersistentPostRun, and improves OAuth login robustness by surfacing ListenAndServe startup failures (via an error channel) instead of failing silently. Also routes login/logout success messaging through cctx.Printer for consistent output handling.

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[cursor]

Cursor Bugbot has reviewed your changes and found 1 potential issue.