Fix: Apply _globals defaults for all bundled plugins in preview builds (fixes #207)

[taylortom]

Fixes #207

Fix

• AdaptFrameworkBuild.applySchemaDefaults now defaults _globals on the course/config schema across the full bundled plugin set (preview = enabled + disabled non-theme/menu), matching what's actually in the shared prebuilt bundle. Content-item defaults stay scoped to enabled plugins. No-op for publish/export builds, which bundle only enabled plugins.

Testing

1. With adapt-contrib-media installed but NOT enabled on a course, preview it (forcing a prebuilt-cache restore).
2. Confirm the console no longer throws Cannot read properties of undefined (reading 'playText') from mediaLibrariesOverrides during app:dataReady, and that Page Level Progress / other extensions initialise.
3. Check the built course/<lang>/course.json has _globals._components._media populated.
4. Confirm a publish/export build is unchanged (only enabled plugins' globals present).

[github-actions]

🎉 This PR is included in version 3.1.4 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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