fix(windows): 修复翻译态 Capsule 宿主标题条重新出现

[Cooper-X-Oak]

摘要

Fixes #190.

这个 PR 解决的单一目标是：
修复 Windows 在翻译态（显示“● 正在翻译” badge）时，Capsule 宿主标题条 / 原生 chrome 重新暴露的问题。

说明：

• 普通 Capsule 主修线已经在本地独立验证通过
• 本 PR 只聚焦翻译态专属回归
• 当前分支基于普通 Capsule 修复基线 cad8536 叠加最小增量提交 c5cdc8d

修复 / 新增 / 改进

• 在 configure_capsule_window_for_platform(...) 中显式调用 window.set_decorations(false)
• 确保翻译态扩高 / 重新显示路径不会把 Windows 原生标题条带回 Capsule 宿主窗口
• 将问题继续限定在 Windows 宿主 non-client area / decorations 路径，不回到 pill 本体视觉层

兼容

• 不包含：普通 Capsule 主修线、QA 宿主矩形问题、helper-window lifecycle 主线、macOS 修复
• 对现有用户 / 本地环境 / 构建流程的影响：
  • 仅影响 Windows 翻译态 Capsule 宿主窗口承载
  • 普通非翻译态 Capsule 行为不在本 PR 主修范围内扩散

测试计划

• 命令：npm exec tsc; npx vite build

• 结果：通过

• 证据路径：clean worktree codex/issue-190-translation-delivery 本地终端构建记录

• 命令：Set-Location src-tauri; cargo check --manifest-path Cargo.toml

• 结果：通过

• 证据路径：clean worktree openless-all/app/src-tauri 本地检查记录

• 命令：本地 debug 运行 + WebView2 remote debugging + 翻译态复现

• 结果：通过

• 证据路径：翻译态复现下，可见 Capsule 原生样式不再包含 WS_CAPTION；对应 issue 证据已补充到 [windows] Capsule 宿主标题条仍然可见，用户没有只看到胶囊本体 #190

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[chatgpt-codex-connector]

💡 Codex Review

https://github.com/appergb/openless/blob/c5cdc8dabf0f17268988bd220a537d4589c6abd0/openless-all/app/scripts/windows-ui-config.test.mjs#L80-L81
Update Windows UI config test to match refactored capsule layout

This assertion still expects the old Windows host metrics (220/118/84 with bottomInset: 12) even though this commit changes getCapsuleHostMetrics to 196/92/52 with bottomInset: 0, so the script now fails immediately (node scripts/windows-ui-config.test.mjs). Keeping this stale check makes the regression test unusable and masks future config regressions.

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[chatgpt-codex-connector]

Guard Windows-only main-window calls with cfg blocks

configure_main_window_for_platform now calls apply_mica and apply_windows_rounded_frame outside any #[cfg(target_os = "windows")] block, so non-Windows builds hit Windows-specific symbols in a function compiled for all targets. This breaks macOS/Linux compilation paths (and also applies set_decorations(false) unconditionally), so the change is not portable across the repo’s supported platforms.

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