Fix dark theme error text contrast and the README stylesheet setup on TypeScript 6 - #389
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This was referenced Oct 1, 2026
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Fixed
--color-errorto the lighter red the field outline already uses and--color-error-bgto a deep red, so a field's validation message and Arc's command exception panel reach the WCAG AA 4.5:1 contrast on the dark surfaces instead of about 2.5:1. Every explicitly light root or subtree keeps the original red on a light background, including a light subtree under a root that is dark only because of the system setting. (Dark theme: field error text contrast is about 2.5:1 #388)@import, and documents the ambient declarations a TypeScript project needs to import them from TypeScript, so the documented setup type-checks on TypeScript 6 (TS2882). (README stylesheet side-effect imports fail tsc on TypeScript 6 (TS2882) #387)