Blabber Footer Improvements

[jasperf]

This pull request introduces significant updates to the iwz-banner-container-plugin to improve banner alignment, responsiveness, and user experience, particularly for mobile and "Blabber Footer Start" banners. Key changes include CSS enhancements, alignment improvements, and better handling of banner styles and structure.

Enhancements to Banner Responsiveness and Mobile Optimization:

• Added mobile-specific CSS for "Blabber Header" banners to ensure proper display using display: inline-block on screens ≤768px. This prevents banners from overlapping content on mobile devices. (public/css/iwz-banner-container-public.css, public/css/iwz-banner-container-public.cssR66-R72)
• Improved the layout and behavior of "Blabber Footer Start" banners by ensuring sufficient height, removing overflow restrictions, and preventing cut-offs. (includes/class-iwz-banner-container.php, includes/class-iwz-banner-container.phpL916-R948)

Alignment and Styling Improvements:

• Introduced more specific alignment classes (iwz-align-* and iwz-wrapper-align-*) for better control over banner alignment, especially in the "Blabber Footer Start" area. (includes/class-iwz-banner-container.php, [1] [2]
• Added a dedicated content wrapper with alignment-specific classes for banners in the "Blabber Footer Start" area, improving alignment precision. (includes/class-iwz-banner-container.php, includes/class-iwz-banner-container.phpR971-R1004)

Structural and Technical Enhancements:

• Ensured all banners, including single banners, have unique IDs for improved CSS specificity and to prevent conflicts. (includes/class-iwz-banner-container.php, includes/class-iwz-banner-container.phpR1016-R1018)
• Updated the plugin version to 1.9.22 and documented the changes in the CHANGELOG.md file. (iwz-banner-container-plugin.php, [1] [2]; CHANGELOG.md, [3]