feat: add support for Telegram multi-chat data exports #134
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This PR adds support for parsing Telegram Desktop data exports (all chats) in addition to the existing single-chat export support. Both formats are automatically detected and processed with full backward compatibility.
Changes
Core Implementation
Testing
Documentation
Testing Results
Backward Compatibility
This change is fully backward compatible. Existing single-chat exports continue to work exactly as before with no changes required from users.