- Remove save_clipboard_image and cleanup_temp_images backend commands
- Update FloatingPromptInput to store pasted images as data URLs in the prompt
- Update ImagePreview component to handle both file paths and data URLs
- Update extractImagePaths to properly handle quoted data URLs
- Update handleRemoveImage to handle data URL removal
This eliminates file system operations for pasted images and stores them directly
in the prompt as base64 data URLs (e.g., @"data:image/png;base64,...").
Images are now fully self-contained within the session without creating temp files.
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