Improved Markdown rendering

### Feature summary

Better Markdown rendering

### What problem are you trying to solve?

I've been using Obsidian for a long time to manage my knowledge bases and view markdown files. The new app is great and I spend more and more time there for knowledge management. The only things that keeps me from migrating completely is the markdown rendered. A few things

- The frontmatter is not nicely rendered as a list
- Callout syntax is not supported (which really makes files more readable)
- Wikilinks to other files should lead me there.

### Proposed solution

_No response_

### Workflow impact

_No response_

### Installation context

_No response_

### Additional context

_No response_

首先定位 app 的 Markdown 渲染入口点以及现有的渲染测试。检查当前如何处理 frontmatter、callouts 和 wikilinks；完成的标准是每一种都能得到适当渲染，wikilinks 能导航到其目标文件，并且相关测试通过。

由索引模型根据 Issue 内容生成。