Concise monthly summary for Telegram-iOS (May 2026). Delivered richer content support and stabilized rendering for InstantPage BlockQuote with nested blocks, enabling multi-block quotes and richer content presentations. Implemented nested-blocks payload across API parsing, serialization (Postbox + FlatBuffers), encoding, and rendering for V1/V2 layouts, along with enhanced markdown parsing and entity expressibility for nested quotes. Fixed and stabilized streaming-related rendering edge-cases (bottom inset and bubble height) to ensure consistent UI during status transitions. Collaborative work with CLAUDE on co-authored changes. Resulting in improved content expressiveness, reduced churn during content rendering, and a stronger foundation for future rich content features.