feat: add /export and /import commands to shell mode; update context …

[RealKai42]

Checklist

• I have read the CONTRIBUTING document.
• I have linked the related issue, if any.
• I have added tests that prove my fix is effective or that my feature works.
• I have run make gen-changelog to update the changelog.
• I have run make gen-docs to update the user documentation.

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[Copilot]

Pull request overview

Updates the user guides to reflect recent shell/status-bar behavior changes in Kimi Code CLI, especially around context display and shell-mode slash commands.

Changes:

• Update session guides (EN/ZH) to mention token counts shown alongside context usage in the status bar.
• Update interaction guides (EN/ZH) to list /export and /import as supported slash commands in shell mode.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 4 comments.

File	Description
docs/zh/guides/sessions.md	Document token-count-inclusive context status bar display (ZH).
docs/zh/guides/interaction.md	Add /export and /import to shell-mode slash command list (ZH).
docs/en/guides/sessions.md	Document token-count-inclusive context status bar display (EN).
docs/en/guides/interaction.md	Add /export and /import to shell-mode slash command list (EN).

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[Copilot]

The example token count format doesn’t match the actual status formatter: format_token_count() drops trailing .0, so 10.0k would display as 10k. Consider updating the example to something like context: 42.0% (4.2k/10k) to reflect real output.

Suggested change

	The bottom status bar displays the current context usage with token counts (e.g., `context: 42.0% (4.2k/10.0k)`), helping you understand when you need to clear or compact.
	The bottom status bar displays the current context usage with token counts (e.g., `context: 42.0% (4.2k/10k)`), helping you understand when you need to clear or compact.

[Copilot]

示例里的 Token 格式和实际状态栏输出不一致：format_token_count() 会去掉末尾的 .0，因此 10.0k 实际会显示为 10k。建议把示例改成类似 context: 42.0% (4.2k/10k) 以匹配真实输出。

Suggested change

	底部状态栏会显示当前的上下文使用率和 Token 数量（如 `context: 42.0% (4.2k/10.0k)`），帮助你了解何时需要清空或压缩。
	底部状态栏会显示当前的上下文使用率和 Token 数量（如 `context: 42.0% (4.2k/10k)`），帮助你了解何时需要清空或压缩。

[Copilot]

Now that /export is listed as a supported slash command in shell mode, the warning below becomes ambiguous because it mentions export (the shell built-in) without a slash. Consider clarifying that the warning refers to environment-changing shell commands (e.g., export FOO=bar) and is unrelated to the /export slash command.

Suggested change

	In shell mode, each command executes independently. Commands that change the environment like `cd` or `export` won't affect subsequent commands.
	In shell mode, each command executes independently. Shell built-ins that change the environment, like `cd` or `export FOO=bar` (not the `/export` slash command), won't affect subsequent commands.

[Copilot]

现在在 Shell 模式斜杠命令列表里加入了 /export，但下面的注意事项又写了 export（无斜杠，指 shell 内建命令），容易让读者误以为和 /export 是同一件事。建议在提示里明确这是指修改环境的 shell 命令（例如 export FOO=bar），并说明与 /export 斜杠命令无关。

Suggested change

	Shell 模式中每个命令独立执行，`cd`、`export` 等改变环境的命令不会影响后续命令。
	Shell 模式中每个命令独立执行，这里的 `cd`、`export` 等是指修改环境的 Shell 命令（例如 `export FOO=bar`），不会影响后续命令，且与上面的 `/export` 斜杠命令无关。