- Add retry loop with backoff to _unpin_message_for_user (max 3 attempts)
- Add TelegramRetryAfter handling in _send_and_pin_message (unpin + send phases)
- Fix missing failed_count increment when all broadcast retries exhaust (for/else)
- Remove dead code in unpin_active_pinned_message (unreachable TelegramRetryAfter catch)
- Harden sanitize_html: allowlist URI schemes (http/https/tg/mailto/tel), whitelist
tag attributes, strip all attrs from tags without explicit whitelist, full HTML
entity decoding via html.unescape
- Add pyproject.toml with uv and ruff configuration
- Pin Python version to 3.13 via .python-version
- Add Makefile commands: lint, format, fix
- Apply ruff formatting to entire codebase
- Remove unused imports (base64 in yookassa/simple_subscription)
- Update .gitignore for new config files
