feat: Add configurable prompt text for homework edit dialog

[Copilot]

Summary

This PR implements customizable prompt text for the homework edit dialog, addressing the issue where students found the current text "喵？喵呜！" inappropriate.

Changes (minimal, only feature-related):

1. Added Two New Settings (src/utils/settings.js)

• edit.autoSavePromptText - Configurable text for auto-save mode (default: "喵？喵呜！")
• edit.manualSavePromptText - Configurable text for manual save mode (default: "写完后点击上传谢谢喵")

2. Updated HomeworkEditDialog Component (src/components/HomeworkEditDialog.vue)

• Changed line 7 to use computed properties instead of hardcoded text
• Added autoSavePromptText() and manualSavePromptText() computed properties

3. Updated Edit Settings Card (src/components/settings/cards/EditSettingsCard.vue)

• Added UI elements for the two new settings

Checklist:

• Add new settings to settings.js
• Update HomeworkEditDialog.vue to use configurable text
• Add settings to EditSettingsCard.vue
• Remove all unnecessary formatting changes
• Build and verify the project works

Fixes #13

Original prompt

---

This section details on the original issue you should resolve

<issue_title>feat: 建议允许更改作业编辑提示框中的提示文本</issue_title>
<issue_description>## 问题

我们班的同学觉得这里 喵？喵呜！ 不太合适

Classworks/src/components/HomeworkEditDialog.vue

Line 7 in 0af2c4c

{{ autoSave ? "喵？喵呜！" : "写完后点击上传谢谢喵" }}

可能的方案

• 可编辑方案 在配置中加入编辑文本/开关模式选项
• 直接替换方案 直接替换这里的文本
  </issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes feat: 建议允许更改作业编辑提示框中的提示文本 #13

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[Sunwuyuan]

@copilot 删除不必要的格式修改，同步最新提交解决冲突

[Copilot]

@copilot 删除不必要的格式修改，同步最新提交解决冲突

Removed all unnecessary formatting changes. The PR now only contains minimal essential changes in 3 files:

• src/utils/settings.js - added 2 new settings
• src/components/HomeworkEditDialog.vue - updated to use configurable text
• src/components/settings/cards/EditSettingsCard.vue - added settings UI

Latest commit: 07a89dc