fix(slack): use runtime origin for onboarding links

[TheodoreSpeaks]

Summary

• Use the runtime public URL for Slack onboarding buttons and the matching links saved in Sim chat history. Shared builds now use the deployment origin instead of retaining the build-time localhost default.
• Add regression coverage for different runtime origins and missing configuration. Previously sent messages keep their saved links.

Type of Change

• Bug fix

Testing

• Reproduced the incorrect URL with regression tests before applying the fix.
• 266 focused tests across 23 suites passed, along with app/auth typechecks, lint, all 46 repository audits, block-registry and docs-manifest checks.
• No live Slack smoke test or deployment performed.

Checklist

• Code follows project style guidelines
• Self-reviewed my changes
• Tests added/updated and passing
• No new warnings introduced
• I confirm that I have read and agree to the terms outlined in the Contributor License Agreement (CLA)

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1 Skipped Deployment

Project	Deployment	Actions	Updated
docs	Skipped		Sep 9, 2026 10:07pm UTC

[TheodoreSpeaks]

@greptile

[TheodoreSpeaks]

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[cubic-dev-ai]

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[greptile-apps]

Greptile Summary

This PR updates Slack onboarding links to use the runtime public application URL rather than the statically imported environment value.

• Routes onboarding buttons through the existing normalized getBaseUrl() utility.
• Adds regression coverage for multiple deployment origins and missing runtime configuration.
• Preserves already-generated links by changing only link creation for new onboarding messages.

Confidence Score: 5/5

The PR appears safe to merge, with the runtime URL behavior covered by focused regression tests and no actionable failures identified.

The production caller runs server-side, where getBaseUrl() reads the runtime environment expected by supported deployments; it consistently supplies the same generated URL to Slack and persisted message data, and missing configuration already failed under the previous implementation.

Important Files Changed

Filename	Overview
apps/sim/lib/slack-search/onboarding.ts	Replaces the direct environment base URL with the runtime-aware, normalized application URL utility.
apps/sim/lib/slack-search/onboarding.test.ts	Verifies runtime-origin selection and explicit failure when the public URL is unavailable.

_{Reviews (1): Last reviewed commit: "fix(slack): use runtime origin for onboa..." | Re-trigger Greptile}