[PaulHax]

The OCT navigation and oblique windowing E2E tests can send Escape while the Window & Level popup is still opening. On macOS, the menu then remains visible and the closure assertion times out.

Wait for the linked menu content to be displayed and stable before closeMenu() sends Escape, and use the shared menu helpers for the oblique test's open/close sequence. The tests still send one Escape and assert both the collapsed activator and hidden content.

This extracts 296303c from #1003 so the shared test fix can land independently of adaptive volume rendering.

Evidence:

• The same OCT dismissal stack appears in #1003, #1013, and #1015. The Add adaptive volume rendering defaults and reset controls #1003 run also fails the raw click/Escape sequence in oblique-windowing; Linux passes.
• This existing fix passed both platforms in its first run, the next run, and the latest #1003 run.
• The opening/readiness race is the supported explanation; the exact event timing has not been reproduced locally.

Validation:

• Production build on the unchanged application source passed.
• Changed-file Prettier and ESLint, vue-tsc --noEmit, repository quality checks, and git diff --check passed.
• Local E2E execution could not start Chrome because the cloud environment blocks its required Unix socket. This PR runs the full E2E matrix on current main.

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