dsh-whale-font: Display "I/You/I/Me" in DSH chats as blue whale icons

`dsh-whale-font` is a Web plugin for DeepSeek Harness (DSH), maintained by kxSenlin and licensed under the MIT License. It operates solely on the display layer; it does not modify message data, interfere with model reading or memory, or affect the input box. Its core function is to replace subject pronouns in conversations (such as "I" in assistant messages, "you" in user messages, and "I/me" in assistant messages) with the DeepSeek Blue Whale icon to intuitively distinguish speakers. The plugin supports custom replacement words (currently uniformly displayed as the whale icon). Chinese replacements are implemented using colored fonts, while English replacements use word boundary matching at the DOM layer. Content within quotes, parentheses, and code blocks is not replaced by default. Installation is performed via the `dsh plugin` command and supports both online and offline installation.