Issue #3611778 by krisjahn: Render slug outside the ad slot div so it survives ad rendering

Kris Koehlerrequested to merge
issue/dfp-3611778:3611778-slug-is-never into 3.0.x

The slug was output inside the placeholder div that GPT uses as its ad render target. When an ad is served, GPT replaces the div's content with the ad iframe, wiping out the slug. As a result the slug only ever showed when NO ad was served - the opposite of the intended behaviour.

Move the slug into a sibling div (.dfp-slug) rendered before the slot div so it is no longer overwritten when an ad loads.

Co-Authored-By: Claude Opus 4.8 noreply@anthropic.com

Closes #3611778

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