Problem: Shortcode 'island' architecture is fragile and theme-dependent
- SPA div buried deep in theme structure (body > div.wp-site-blocks > main > div#app)
- Theme and plugins can intervene at any level
- Different themes have different structures
- Breaks easily with theme changes
Solution: Dedicated page-based SPA system (like WooCommerce)
- Add page selection in Appearance > General settings
- Store page IDs for Shop, Cart, Checkout, Account
- Full-body SPA rendering on designated pages
- No theme interference
Changes:
- AppearanceController.php:
* Added spa_pages field to general settings
* Stores page IDs for each SPA type (shop/cart/checkout/account)
- TemplateOverride.php:
* Added is_spa_page() method to check designated pages
* Use blank template for designated pages (priority over legacy)
* Remove theme elements for designated pages
- Assets.php:
* Added is_spa_page() check before mode/shortcode checks
* Load assets on designated pages regardless of mode
Architecture:
- Designated pages render directly to <body>
- No theme wrapper/structure interference
- Clean full-page SPA experience
- Works with ANY theme consistently
Next: Add UI in admin-spa General tab for page selection
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