fix(viewer): prevent ResizeObserver feedback loop

[posthog]

Why

A benign browser warning was being reported as a fresh error issue after viewer deployments, creating recurring triage noise.

Problem

The 3D viewer observed its container and resized an in-flow canvas from inside the observer callback. Updating that canvas could change the observed layout and make the browser terminate the resize cycle with an undelivered-notifications warning.

Context: PostHog Inbox report

Changes

• Remove the Three.js canvas from the observed container layout.
• Skip renderer and camera updates when the measured dimensions have not changed.
• Cover desktop-to-phone resizing and the warning with a browser regression test.
• Add a patch changeset.

Risk

Low. The renderer still uses the measured container dimensions; rollback is the single viewer commit.

Verification

• pnpm check
• pnpm test:e2e (44 passed)

Checklist

• Tests cover new or changed behavior where practical.
• Geometry changes are checked against a real export, not just the preview. (Not applicable; geometry is unchanged.)
• User-facing behavior is documented in the README. (Not applicable; this removes internal browser error noise.)

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Created with PostHog Desktop from an inbox report

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Status	Name	Latest Commit	Preview URL	Updated (UTC)
✅ Deployment successful! View logs	basekit	8227229	Commit Preview URL Branch Preview URL	Aug 27 2026, 09:33 AM