feat(ux): F3 流式进度感 + F4 友好错误文案（纯前端）

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F4：新 lib/errors/messages.ts —— friendlyError(code, fallback) 把错误码映射为
中文文案 + 可选「去设置提供商」动作；覆盖后端 ErrorCode + 前端 NETWORK/
STREAM_FAILED；未知码回退原 message。写作页与审稿页错误块改用之，不再暴露
raw error code。+4 vitest。

F3：写作页工具条字数计数器流式时显示「生成中… N 字」+ 朱砂脉冲
（motion-safe:animate-pulse，尊重 prefers-reduced-motion），停后回「字数 N」。
纯 text.length，无后端改动。

前端门禁绿：lint/typecheck/vitest 171/build。无契约变更。

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This commit is contained in:

Yaojia Wang

2026-06-20 11:02:27 +02:00

parent 8058cfb11a

commit b18310bcb7

6 changed files with 139 additions and 24 deletions

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