test(e2e): expand Playwright coverage for example code snippets

[lokesh-bruno]

Ref BRU-4585

Description

Adds E2E coverage for Code Snippet on request examples so the modal, copy, and variable interpolation behave the same as the request-page snippet when used from an example card.

The coverage includes:

• A Code Snippet button on each saved example, including after expanding a collapsed card.
• Modal languages matching the request-page snippet tab list.
• Snippet body taken from that example, not the base request.
• Copy writing the currently displayed command for every language in the modal.
• No Examples section or snippet trigger when the request has no saved examples.
• Show vars off keeping {{var}} placeholders; Show vars on interpolating both the preview and the copied text.
• Interpolate Variables following Show vars when the modal opens, interpolating without flipping the page toggle, and restoring placeholders when unchecked while Show vars stays on.

[changeset-bot]

🦋 Changeset detected

Latest commit: 6adabe3

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@usebruno/api-docs	Patch

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