- Mark stage-0 links as "Coming Soon" across all language versions
- Update navigation labels from "Product Manager" to "Novice & PM" variants
- Consolidate stage-0 and stage-1 content into single "Novice & Product Prototype" section
- Refactor homepage feature grid to use Apple Store-style layout
- Update stage descriptions and learning path summaries to reflect new structure
- Ensure consistency across all supported languages (en, zh, ja, ko, es, fr, de, ar, vi)
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