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The submit button text color has been hardcoded to white since the 3.0 UnoCSS refactor removed the legacy --halo-comment-widget-component-form-button-submit-color variable without a replacement, while the button background was already wired to --halo-cw-primary-1-color. Themes therefore cannot adjust the text color on primary buttons, and the default white on the light fallback (#4CCBA0) fails WCAG AA contrast (2.03:1); the shipped dark palette (#059669) yields 3.77:1 — both below the 4.5:1 required for 14px text. Introduce --halo-cw-text-submit-color (default #ffffff, preserving the current look) and consume it via a text-text-submit theme token on the comment/reply submit button and the edit form's submit/retry buttons. The deprecated variable row in the theme integration docs now points to its replacement.
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动机
3.0 UnoCSS 重构（ace1c1a）删除了整套旧组件级 CSS 变量，其中提交按钮文字颜色变量
--halo-comment-widget-component-form-button-submit-color没有提供替代：按钮背景后来已接回--halo-cw-primary-1-color（12e83c2），字色却一直写死text-white，成为主色按钮上唯一不由变量驱动的样式面。这带来两个问题：
#4CCBA0上 2.03:1、官方暗色方案#059669上 3.77:1，均低于 14px 按钮文字 WCAG AA 要求的 4.5:1，主题作者无从修复。方案
--halo-cw-text-submit-color（默认#ffffff，不改变现有观感）；uno.config.ts的theme.colors.text中注册为submittoken（与primary-1等变量同款写法），评论/回复提交按钮与编辑表单的提交/重试按钮统一消费；dev/theme-integration.md：现行变量表与 CSS 模板补行，废弃表中旧变量的备注回填替代名。验证
pnpm build通过，产物 CSS 生成text-text-submit{color:var(--halo-cw-text-submit-color, #ffffff);}；#ffffff，与现有渲染完全一致（无视觉 diff）；说明
--halo-cw-primary-contrast-color），我可以随时调整；