Issue template mapping is unclear when creating issues from Copilot

### Summary
When creating an issue from Copilot using a screenshot or natural language prompt, the generated draft does not always make the template selection or field mapping obvious.

### Expected behavior
- Copilot should clearly map the prompt or screenshot to the correct issue template.
- The draft should preserve the relevant template fields and labels.
- If multiple templates match, Copilot should show the selected template clearly before creating the issue.

### Actual behavior
- The draft may feel ambiguous about which template was selected.
- Users can lose confidence in whether the right issue type or fields were applied.
- This makes issue creation slower and more error-prone.

### Steps to reproduce
1. Open Copilot issue creation flow.
2. Attach a screenshot or describe the problem in natural language.
3. Let Copilot draft the issue.
4. Observe that the selected template / mapping is not always obvious.

### Why this matters
This adds friction to issue creation and makes it harder to file accurate issues quickly.

### Additional notes
If there are multiple repository issue templates, the UI should surface the selected template more clearly before final submission.

从复现步骤中描述的 Copilot issue 创建流程开始，比较根据屏幕截图、自然语言提示以及包含多个模板的仓库创建的草稿。确定在提交前所选模板和映射字段的呈现位置。完成标准是明确显示所选模板，保留相关字段和标签，并在创建前展示有歧义的匹配结果。

由索引模型根据 Issue 内容生成。