fix(desktop): readable startup error text in light mode

[ackness]

Requested by yy · project thread

Summary / 摘要

The desktop startup screen follows the system colour scheme, but its light-mode rules skipped the error block. When startup failed with the system in light mode, the error message (#a1a1aa) and hint (#d4d4d8) were drawn in near-white text on the #fafafa background, and the red error title and the spinner's centre dot were faint. The light-mode block now gives them dark colours (#52525b, #3f3f46, #dc2626, #71717a). Like the other rules in that block they carry !important, because the block comes before the base rules in the stylesheet.

Found while reviewing the v0.0.50 Windows splash change from #163. It applies on every platform.

Type of change / 变更类型

• Bug fix / Bug 修复 (fix)

Verification / 验证方式

• pnpm check: could not run in this environment. Turbo fails to spawn child processes (Exec format error), and the container has Node 22, not Node 26.
• Tests of the changed packages: pnpm --filter-equivalent pnpm test in apps/desktop passes.
• node scripts/changelog.mjs check: 1 valid fragment.

Not verified / 未验证: Nobody looked at the screen. The change is four CSS rules inside the existing prefers-color-scheme: light block.

Related issue / context / 关联

#163

Docs sync / 文档同步

• A changelog fragment docs/changelog.d/splash-light-error-text.md
• n/a for reference pages, guides and AGENTS.md

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https://claude.ai/code/session_01HiABm7VuSQwevB8WsHx6EL

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