feat: Supports specified user input title(#2288)

[wangdan-fit2cloud]

What this PR does / why we need it?

Summary of your change

Please indicate you've done the following:

• Made sure tests are passing and test coverage is added if needed.
• Made sure commit message follow the rule of Conventional Commits specification.
• Considered the docs impact and opened a new docs issue or PR with docs changes if needed.

[shaohuzhang1]

The provided code looks mostly correct, but there's a small discrepancy: you've added an el-button with the label "common.add" between the two existing buttons. Instead of using the <span> element to wrap around it, I recommend keeping all elements within the same structure for better semantic integrity.

There are no significant irregularities or potential issues in this code snippet. However, here's the adjusted version:

<div class="flex-between mb-16">
  <h5 class="lighter">{{ $t('chat.userInput') }}</h5>
  <div>
    <el-button type="primary" link @click="openChangeTitleDialog">
      <el-icon>
        <Setting />
      </el-icon>
    </el-button>
    <el-button type="primary" link @click="openAddDialog()">
      <el-icon :class="{ 'mr-4': true }">
        <Plus />
      </el-icon>
      {{ $t('common.add') }}
    </el-button>
  </div>
</div>

This ensures that all buttons have appropriate spacing when the content is rendered in different contexts.

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