Dev 1111 fix blocked video styles

[iranimij]

Note

Introduce a reusable video-blocker and integrate it with Fotorama and PageBuilder slides to block videos until marketing consent; fix PageBuilder iframe/video styling based on Cookiebot consent.

• Frontend:
  • Reusable blocker: Add view/frontend/web/js/video-blocker-widget.js to render a consent blocker overlay and message for videos.
  • Fotorama integration: Refactor fotorama-video-events-mixin.js to use video-blocker-widget instead of inline DOM creation.
  • PageBuilder slides:
    • Add mixin mapping in requirejs-config.js for Magento_PageBuilder/.../slide/appearance/default/widget to CustomGento_Cookiebot/js/slide-widget-mixin.
    • New slide-widget-mixin.js blocks background videos until consent, toggles data-video-src/data-cookieblock-src, injects blocker, restores video and cleans blocker on consent, and reinitializes video-background/jarallax.
  • Iframe handling/styles: Update templates/iframe-handler.phtml script to adjust PageBuilder video container padding/background on Cookiebot events and improve blocked iframe placeholder/message rendering.

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