🐛 Fix block theme header styles and learning area width alignment

[b-l-i-n-d]

• Pre-render header block template parts before wp_head() so WordPress block container layout styles (wp-container-*) apply to custom header and footer in block themes
• Output late-generated block support styles in tutor_custom_footer()
• Ensure .tutor-learning-page maintains full width in flex containers without shrinking
• Align Learning Area content right-edge padding with the header layout
• Prevent mobile viewport content from being pushed off-screen by rejecting oversized mobile menu drawers in sticky header offset detection
• Maintain consistent sticky header offsets during scroll for themes with sticky/transparent headers
• Smoothly transition mobile admin bar offset as it leaves the viewport
• Prevent redundant top padding on active quiz submission screens in site-shell mode
• Deduplicate admin-bar specificity selector blocks across SCSS partials
• Keep site-shell TypeScript controller functions and baseline structure aligned with dev
• Conditionally attach the scroll listener only when a sticky theme header or WordPress admin bar is present