feat(dashboard): link git sha and ref to GitHub on settings page

[nicktrn]

Make the git SHA and git ref in the org settings sidebar clickable links to GitHub — SHA links to the commit, ref links to the branch/tag.

[changeset-bot]

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Latest commit: dff8d70

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

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