* Refactor CSS styles: replace hardcoded colors with CSS variables for accent colors and optimize spacing rules in layout files.
* Update CSS styles: streamline selectors, enhance hover effects, and adjust focus states for chat components and layout elements.
* Enhance focus styles for chat components: update border colors and box-shadow effects for improved accessibility and visual consistency.
* Config UI: click-to-reveal redacted env vars and use lightweight re-render
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