[201_105] Fix unclear keyboard shortcut keys in dark mode

[1sh-repalto]

Fixes #3114

What

Made keyboard shortcut key caps (e.g. Ctrl+V, Ctrl+Shift+V) clearly visible in dark/night mode by introducing theme-overridable color variables for the render-key macro.

Developer Document: devel/201_105.md

Why

In night mode, the render-key macro used hardcoded light gray ornament colors (#e0e0e0, #f0f0f0, #c0c0c0) with no explicit text color. The dark theme sets the global text color to white, resulting in white text on a light gray background — making the shortcut keys nearly unreadable in the default startup document and all tmdoc documentation.

How

Introduced four theme-overridable variables for the render-key macro and added dark mode overrides.

Modified TeXmacs/packages/documentation/standard/tmdoc-gui.ts and TeXmacs/packages/miscellaneous/shortcut-editor.ts:

Replaced hardcoded colors in render-key with variable references:

• render-key-color — text color inside key caps (default: black)
• render-key-bg-color — ornament background (default: #e0e0e0)
• render-key-sunny-color — ornament highlight (default: #f0f0f0)
• render-key-shadow-color — ornament shadow (default: #c0c0c0)

Modified TeXmacs/packages/themes/dark/dark.ts:

Added dark mode overrides for the key rendering variables:

• render-key-color → white
• render-key-bg-color → #606060
• render-key-sunny-color → #808080
• render-key-shadow-color → #404040

How to test

1. Open Mogan Editor.
2. Switch to night/dark mode via Document → Theme → Dark.
3. Open the default startup document or any tmdoc document containing keyboard shortcuts (e.g. <key|Ctrl+v>).
4. Verify:
   • Keyboard shortcut key caps display white text on a medium-gray background.
   • The key caps are clearly readable against the dark document background.
5. Switch back to light mode.
6. Verify:
   • Keyboard shortcut key caps display black text on a light gray background, same as before.

After the fix

[greptile-apps]

Greptile Summary

本 PR 修复了暗黑模式下快捷键图标（render-key 宏）可读性问题。通过将原先的硬编码颜色替换为可主题化变量，并在 dark.ts 中添加深色模式覆盖值，解决了深色主题下白色文字叠加浅灰背景导致的低对比度问题。

Confidence Score: 5/5

此 PR 可安全合并，修复逻辑正确，不引入任何运行时错误或数据问题。

所有改动均为样式包中的颜色变量替换，默认值与原硬编码值完全一致，不影响现有亮色主题的表现；深色主题覆盖值合理，唯一发现为 P2 级别的重复定义建议，不阻碍合并。

无需特别关注的文件。

Important Files Changed

Filename	Overview
TeXmacs/packages/documentation/standard/tmdoc-gui.ts	新增 4 个 render-key 颜色变量（默认值与原硬编码值一致），并将 render-key 宏更新为引用这些变量；变量默认值与 shortcut-editor.ts 完全相同（存在重复定义）。
TeXmacs/packages/miscellaneous/shortcut-editor.ts	与 tmdoc-gui.ts 相同的 4 个颜色变量及 render-key 宏更新，变量默认值完全一致，存在重复定义。
TeXmacs/packages/themes/dark/dark.ts	新增深色模式的 render-key 颜色覆盖值（白色文字、中灰背景），位置合理，颜色层次清晰。
devel/201_105.md	新增开发者文档，清晰描述了问题原因、解决方案及测试步骤。

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    A["render-key 宏调用"] --> B{当前主题}
    B -->|"普通 / 亮色主题"| C["render-key-color = black\nrender-key-bg-color = #e0e0e0\nrender-key-sunny-color = #f0f0f0\nrender-key-shadow-color = #c0c0c0"]
    B -->|"dark 主题"| D["render-key-color = white\nrender-key-bg-color = #606060\nrender-key-sunny-color = #808080\nrender-key-shadow-color = #404040"]
    C --> E["ornament: 黑色文字 + 浅灰背景（可读）"]
    D --> F["ornament: 白色文字 + 中灰背景（可读）"]

    style E fill:#e0e0e0,color:#000
    style F fill:#606060,color:#fff

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[greptile-apps]

变量默认值与 tmdoc-gui.ts 完全重复

render-key-color、render-key-bg-color、render-key-sunny-color、render-key-shadow-color 四个变量的默认值在 tmdoc-gui.ts（第 31–37 行）和本文件中完全相同。若将来需要调整默认值，必须同步修改两处，容易遗漏。建议将这四个默认值定义提取到公共位置（如 base-colors.ts），两个文件通过 use-package 引用，从而保证单点维护。