Enter Key Fix for ChatGPT/Gemini/Mistral per Takahiro

This add-on is designed to optimize the text input experience on multiple mainstream AI chat platforms, supporting platforms such as OpenAI ChatGPT, Google Gemini and Mistral Le Chat.

Main features:
* Enter key line break: Changes the default function of the Enter key from “send message” to “line break,” making it more convenient to input multiple lines of text
* Ctrl+Enter send: Use the Ctrl+Enter key combination to send messages, replacing the original Enter key send function
* One-click toggle: Provides a convenient toggle button, allowing you to enable or disable this feature at any time to flexibly adapt to different usage needs
* Multi-platform support: Seamlessly integrates with major AI chat services to ensure a consistent user experience across different platforms

This plugin is particularly suitable for users who need to input long texts, code, or multi-paragraph content, avoiding the accidental sending of unfinished messages and improving interaction efficiency with AI assistants.