fix(web): take three characters the display font draws as solid squares from the next font

[ackness]

⚠️ Breaking changes / 不兼容变更

None.

Summary / 摘要

In the Stage style a title that contains 回 showed a solid square in its place. The bundled display font (ZCOOL XiaoWei) draws 回, 圃 and 圄 with their inner outlines in the same direction as the outer one, so the character is filled. A unicode-range on the font face leaves those three characters to the next family in the stack.

Type of change / 变更类型

• Bug fix / 修复 (fix)

Verification / 验证方式

• Every CJK character of the font (5834) rendered in Chromium and measured: these three are the only ones that come out as a near-solid block
• Screenshot of a session's rules panel before and after: the title "回声是可能性而非命运" reads correctly
• pnpm lint in the pre-commit hook

Not verified / 未验证: other browsers and the desktop app were not looked at.

Docs sync / 文档同步

• Changelog fragment