jetbrains air - 1 つのシステムでエージェントを利用したソフトウェア構築を実現

Add a dark mode toggle to the site header

On it — I’ll add a dark-mode toggle to the site header and persist the choice so it survives reloads. Scanning the project: the header lives in components/Header.tsx and there’s no theme provider yet, so I’ll add a small useTheme hook alongside it.

Done. The toggle is wired to a small useTheme hook backed by React context, and the choice persists to localStorage so the site reopens in the last-used mode. The button swaps a sun/moon icon, exposes aria-pressed, and is reachable by keyboard. I also moved the header’s hard-coded colors to CSS variables.

0.58 credits · 4s

Default to the system color scheme on first visit

Good call — I’ll read the system preference on first load and only override it once the user picks a theme, so returning visitors keep their choice.

Done. First-time visitors now inherit their OS light/dark setting, and the toggle still wins and persists after that. I also added a listener so the site follows OS changes until a manual choice is made.

0.31 credits · 3s