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screenshot while paused: warn that UGUI shows the previous frame and suggest a single step to refresh #2392

Description

@hatayama

Background

Usability-feedback round 24 (2026-08-24, revision 9cefd73). Reported at 4/10 with 2 wasted round trips. Verified by the tester with full-response searches: no warning or note about this appears anywhere in the screenshot response.

Problem

Taking a uloop screenshot while the editor is paused at a pause point captures UGUI elements as they were on the previous rendered frame (Unity canvas rendering behavior), while other observations reflect the paused state. The mismatch made the tester distrust the screenshot and spend 2 round trips confirming which side was stale.

Proposal

When a screenshot is taken while Play Mode is paused, add a Warnings entry noting that UGUI/canvas content may reflect the previous frame, and that stepping one frame (control-play-mode --action Step) before capturing refreshes it. This is guidance-only; no change to capture behavior is required.

Severity

4/10 (Unity-side behavior; the cost is the missing note, not the capture itself).

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