Global classes refactor docs

[ronros-elementor]

✨ PR Description

1. Problem & Context

Documentation expansion for Elementor's atomic architecture refactor. Adds comprehensive guides for atomic elements, widgets, styles, prop values, and global classes alongside new hook documentation for cache invalidation and kit imports.

2. What Changed (Where)

File	Change
src/data-structure/atomic-*.md	5 new docs: elements, widgets, prop-values, styles, global-classes (635 lines total)
src/hooks/atomic-*.md + kit-meta-to-preserve-on-import.md	4 new hook docs with PHP examples
src/.vuepress/sidebars/data-structure.js	Added "Atomic Structure" collapsible section
src/.vuepress/sidebars/hooks.js	4 new hook references in action hooks list
src/data-structure/index.md + src/hooks/php.md	Index references to all new docs

3. How It Works

New docs follow consistent structure: Badge tags (Core/Intermediate-Advanced), concise JSON schema examples with typed $type/value patterns, reference tables for PHP APIs/REST endpoints, and real-world nesting examples. Sidebar updates expose docs in navigation; hook registrations link to new action/filter documentation in PHP hooks index. No code changes—purely documentation.

4. Risks

None. Documentation-only additions with backward-compatible sidebar structure (collapsable: false, existing sections unchanged). New hook docs reference existing functionality without altering behavior.

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