- Move MimeTypeToFileTypes and FileTypeToMimeType mappings to dedicated FileTypeMimeTypeMapping enum file
- Add empty content validation for file attachments
- Add PDF support for Gemini
- Display attachment references in user messages with file info
- Fix OpenAI unsupported mime type message formatting
- Improve URI list handling in InputService to include text/plain
- Update chat area padding and styling for better attachment display
- Prevent drag selection on chat padding element
- Update test assertions for new unsupported mime type message format
Remove custom backspace key handler in ChatInput and unused getElementBeforeCursor method in InputService. Clean up unused imports and associated test cases.
Replace getNodeAtCursorPosition with getElementBeforeCursor for more robust element detection before cursor. Add cursor position validation after deletions to prevent cursor from ending up inside contenteditable="false" elements. Remove unused helper methods and reorganize code structure.
