docs(loop): 改进 while 循环 continue 表达式章节

[lilhammerfun]

Summary

• 重写 continue 表达式章节，先给出定义和代码示例，再结合基本示例中的死循环问题解释其作用
• 新增 while_continue_fix 代码示例，展示 continue 表达式如何解决手动递增被跳过的问题
• 补充执行顺序说明和 break 不触发 continue 表达式的提示

Test plan

• zig build 编译通过
• bun dev 本地预览确认渲染效果

[gemini-code-assist]

Summary of Changes

Hello @lilhammerfun, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

此拉取请求旨在通过重写 while 循环中 continue 表达式的文档，显著提升其清晰度和实用性。更新后的内容不仅提供了更详细的定义和示例，还特别强调了 continue 表达式在防止潜在死循环方面的关键作用，并新增了一个具体的代码示例来直观地演示这一机制，从而帮助读者更好地理解和应用这一控制流语句。

Highlights

• 改进 while 循环 continue 表达式章节: 重写了 continue 表达式的定义和示例，并解释了其如何解决基本示例中的死循环问题。
• 新增代码示例: 增加了 while_continue_fix 代码示例，展示了 continue 表达式如何避免手动递增被跳过。
• 补充说明: 补充了循环执行顺序的说明，并提示 break 不会触发 continue 表达式。

Changelog

• course/basic/process_control/loop.md
  • 重写了 continue 表达式的定义，明确了其执行时机（每轮循环体结束后、下一轮条件判断之前）。
  • 引入了 while_continue_fix 代码示例的引用。
  • 详细说明了 while 循环中包含 continue 表达式的执行顺序。
  • 解释了 continue 表达式如何解决在特定条件下可能导致的死循环问题。
  • 添加了一个提示，说明 break 语句会直接退出循环，因此不会执行 continue 表达式。
  • 澄清了 continue 表达式可以是单个语句或代码块。
• course/code/15/loop.zig
  • 新增了 while_continue_fix 代码段，演示了如何在 while 循环中使用 continue 表达式来确保循环变量 i 即使在 if (i == 5) continue; 的情况下也能正确递增，从而避免死循环。

Activity

• 已通过 zig build 编译。
• 已通过 bun dev 在本地预览并确认渲染效果。

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[gemini-code-assist]

Code Review

这次改进非常好地解释了 continue 表达式的作用，特别是通过对比基本示例中的死循环问题，让读者更容易理解其必要性。新增的代码示例和执行顺序说明也非常清晰。针对文档的准确性和代码风格的一致性，我提出了一些小的改进建议。

[gemini-code-assist]

为了与该文件中的其他 if 语句风格保持一致，建议为 if 块添加大括号。

                if (i == 5) {
                    continue;
                }

[jinzhongjia]

感谢 pr