feat(theme): add light/dark mode toggle#253
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- New ThemeToggle component (sun/moon icon) in the nav and footer area - User choice persists in localStorage; falls back to OS preference on first visit - Inline script in <head> sets data-theme on <html> before paint (no FOUC) - Refactor color CSS to react to [data-theme="dark"] selector; @media (prefers-color-scheme) blocks kept as JS-disabled fallback - Swap nav and footer logos based on theme (was using <picture> tied to OS) - Home header continues to force the white-text logo (blue background)
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Adds a light/dark mode toggle button to the nav.
Changes:
ThemeTogglecomponent (sun/moon icon, top-right of nav)localStorage; first-time visitors get their OS preference as the starting point<head>setsdata-themeon<html>before paint, so no flash of wrong theme[data-theme="dark"]selector. The@media (prefers-color-scheme: dark)blocks are kept as a fallback for users with JS disabled.Decorative image swaps (connectors, background patterns) still follow OS preference — happy to extend if reviewers want that.