Preview MCP reports navigation timeout after completion and stale viewport after resize #32341

The T3 preview MCP browser returned errors while the local page completed navigation. This makes browser evidence capture ambiguous under load.

Observed in a Windows Codex worktree on November 7, 2026, against a loopback Next 16.4.5 server:

1. preview_open({target:{kind:"environment-port",port:4798,path:"/hipaa-cloud-comparison"}}) returned Preview automation navigate timed out after 15000ms.
2. The next preview_status reported the requested URL/title, loading:false, and caller-owned tab.
3. preview_resize({mode:"freeform",width:375,height:812}) reported setting 375x812 but actual viewport 1280x800.
4. preview_snapshot({includeImage:true,save:true}) returned Preview snapshot failed: Preview automation snapshot timed out after 15000ms.

Local Playwright subsequently captured the same page at 375px and 1440px. The tab was closed. No private content or secrets are included here.

Expected: navigation timeout results should expose whether navigation completed and the current page state, and resize should acknowledge the requested viewport only once actual dimensions match (or report pending/error explicitly). Snapshot timeout should identify whether it is waiting on page execution, screenshot capture, or transport so recovery can be scoped.