chore(web): Bake PostHog token into build

[brendan-kellam]

Fixes SOU-116

[coderabbitai]

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch bkellam/telemetry_improvements

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[github-actions]

@brendan-kellam your pull request is missing a changelog!