formats all dart files using `dart format .` from the root project dir
this makes the code style repeatable by new contributors and makes PR review easier
- Reduce reaction payload from ~44 bytes to 9 bytes (5x smaller)
- Use 4-char hex hash (timestamp + sender + first 5 chars) for message ID
- Use 2-char hex emoji index instead of multi-byte UTF-8 emoji
- Format: r:HASH:INDEX (e.g., r:a1b2:00)
- For 1:1 chats, sender is implicit (null) for shorter hash
- Prevent users from reacting to their own messages
- Add room server reaction support with sender identification
- Make emoji lists public in EmojiPicker for shared indexing
- Add 💪 and 🚀 emojis to picker
- Add comprehensive unit tests for reaction helpers
- Update minor dependencies
- Introduced a new extension for localization in Flutter with `LocalizationExtension` in `l10n.dart`.
- Added a Python script `translate.py` for translating ARB/JSON localization files using a local Ollama model, preserving keys and placeholders, and handling ICU format rules.
