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## Summary Use TextEncoder/TextDecoder for UTF-8 safe base64 encoding/decoding When copying nodes containing non-Latin1 characters (e.g., Chinese characters in localized_name field), btoa() throws an error: InvalidCharacterError: Failed to execute 'btoa' on 'Window': The string to be encoded contains characters outside of the Latin1 range. The copy operation saved data to localStorage successfully, but failed to write to the browser clipboard. On paste, the browser clipboard still contained old data, causing the wrong node to be pasted. <!-- Fixes #ISSUE_NUMBER --> https://github.com/Comfy-Org/ComfyUI_frontend/issues/6993 https://github.com/Comfy-Org/ComfyUI_frontend/issues/5449 https://github.com/comfyanonymous/ComfyUI/issues/8481 ## Screenshots (if applicable) before https://github.com/user-attachments/assets/8abd9049-91bb-4200-8853-e26753376007 after https://github.com/user-attachments/assets/7d969f32-bb0f-4c7a-baa2-65d576a4eba2 ┆Issue is synchronized with this [Notion page](https://www.notion.so/PR-7103-fix-handle-Unicode-characters-in-clipboard-copy-paste-and-add-Paste-menu-option-2bd6d73d365081f39c40e7e7f832b97c) by [Unito](https://www.unito.io) --------- Co-authored-by: github-actions <github-actions@github.com>