Use cover images for OpenGraph metadata

[si]

Motivation

• Social previews should use a post's artwork when available, so prefer the post coverImage for the OpenGraph og:image and ensure the URL is absolute.

Description

• Updated src/_layouts/base.njk to set ogImage = coverImage or page.data.coverImage and use that value for og:image.
• Build absolute image URLs by prefixing with meta.url for both the chosen cover image and the default HF24-opengraph.png fallback.
• Kept the existing fallback behavior when no cover image is present.

Testing

• No automated tests were run for this change.

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Codex Task

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