[Bug]: Default input field has character limit

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Issue Checklist

• I understand that issues are for feedback and problem solving, not for complaining in the comment section, and will provide as much information as possible to help solve the problem.
• My issue is not listed in the FAQ.
• I've looked at pinned issues and searched for existing Open Issues, Closed Issues, and Discussions, no similar issue or discussion was found.
• I've filled in short, clear headings so that developers can quickly identify a rough idea of what to expect when flipping through the list of issues. And not "a suggestion", "stuck", etc.
• I've confirmed that I am using the latest version of Cherry Studio.

Platform

Windows

Version

2.1.3

Bug Description

The user input field has a character limit. When you input 40,000 characters, it gets stuck and won't let you input more content. This is a problem I never encountered in the V1 version.

Steps To Reproduce

Try copying and pasting 70,000-80,000 characters at once into the input box to see if you can paste the complete content all at once.

Expected Behavior

Fix this issue

Relevant Log Output

Additional Context

No response

Issue Checklist

• I understand that issues are for feedback and problem solving, not for complaining in the comment section, and will provide as much information as possible to help solve the problem.
• My issue is not listed in the FAQ.
• I've looked at pinned issues and searched for existing Open Issues, Closed Issues, and Discussions, no similar issue or discussion was found.
• I've filled in short, clear headings so that developers can quickly identify a rough idea of what to expect when flipping through the list of issues. And not "a suggestion", "stuck", etc.
• I've confirmed that I am using the latest version of Cherry Studio.

Platform

Windows

Version

2.1.3

Bug Description

用户输入栏这里有字数上限，输入40000字就会卡主，不让你再输入内容了，这是我在V1版中从来没碰上过的问题。

Steps To Reproduce

一次性在输入框里复制粘贴七八万字，试试看能否一次性粘贴完整内容。

Expected Behavior

修复这个问题

Relevant Log Output

Additional Context

No response