Add 'map' page theme with navy wallpaper background

[lamontacrook]

What

Adds a page-level `map` theme. Authors enable it by setting the page metadata field `theme` to `map`; aem.js turns that into a `map` class on `` (`decorateTemplateAndTheme`). The theme:

• paints an authored image (`/en/bg-image/media_10ead71e9c8ea3a31cc74259d6397c1b2b7f5eac4.png`) as a full-page wallpaper that scrolls with the content
• fills any uncovered area with navy `#022658`
• lifts text, headings, and plain links to white for contrast on the dark background (mirrors the existing `.section.dark` treatment)

The rule lives in `styles/lazy-styles.css` because the wallpaper is decorative and not LCP-critical.

Preview

Base preview: https://map-page-theme--hal--AdobeDevXSC.aem.page/

⚠️ The visual effect only shows on a page whose metadata `theme` = `map`. No existing content page sets that yet, so the wallpaper won't be visible on the preview until an author adds the `theme: map` metadata to a page (e.g. a find-a-cruise page). Happy to point this at a specific path once one exists.

Testing

• Verified on the local dev server: theme class applied, authored image loads (HTTP 200), navy fill + light text render correctly, background scrolls with content.
• `npm run lint:css` passes clean.

🤖 Generated with Claude Code

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Commits

• 152add9 ✅ (latest)

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