fix(landing): reset unmeasurable preview stages

[waleedlatif1]

Summary

• hide responsive landing stages when their host has no measurable space
• reset the applied-scale sentinel so the same scale is restored when space returns
• add regression coverage for visible, hidden, and restored resize states

Type of Change

• Bug fix

Testing

• Full lint and 36 repository audits
• Full type-check
• Responsive design stage tests (5 passing)

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)

[vercel]

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
docs	Skipped		Aug 27, 2026 4:45am

[cubic-dev-ai]

No issues found across 2 files

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

_{Re-trigger cubic}

[greptile-apps]

Greptile Summary

The PR fixes responsive landing previews that retain stale visibility and scaling state while their host has no measurable space.

• Hides the design surface whenever its calculated scale is zero.
• Resets the applied-scale sentinel so the same scale is reapplied when measurable space returns.
• Adds regression coverage for visible, hidden, and restored resize states.

Confidence Score: 5/5

The PR appears safe to merge, with the corrected zero-scale handling restoring previews when measurable space returns.

The changed branch resets the cached scale while hiding an unmeasurable surface, and the subsequent nonzero ResizeObserver delivery reapplies both scale and opacity; regression coverage exercises the complete transition.

Important Files Changed

Filename	Overview
apps/sim/app/(landing)/components/shared/responsive-design-stage/responsive-design-stage.tsx	Correctly hides unmeasurable preview surfaces and resets cached scale state so visibility and scaling recover on the next measurable resize.
apps/sim/app/(landing)/components/shared/responsive-design-stage/responsive-design-stage.test.ts	Adds a jsdom ResizeObserver regression test covering measurable, collapsed, and restored host dimensions.

_{Reviews (1): Last reviewed commit: "fix(landing): reset unmeasurable preview..." | Re-trigger Greptile}