Render feedback, parsing diagnostics, knowledge confirmations, WeChat binding and image preview overlays through body portals so native titlebar drag regions cannot intercept their controls. Preserve themed form styles and modal focus isolation.
Validation: 320 targeted tests, typecheck and lint passed. Native Windows hover and close checks passed for feedback and parsing diagnostics in light and dark themes at two sizes. Full suite timed out without a summary.
Release note: 修复反馈等弹窗与窗口标题栏重叠时，关闭按钮无法正常悬停和点击的问题。
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