fix: memoize context values to prevent infinite re-renders

[mvanhorn]

Summary

• Memoize ActiveThemeProvider context value with useMemo to prevent new object references on every render
• Memoize BlockViewerProvider context value with useMemo for the same reason
• Consumers now only re-render when the actual context values change

Why this matters

#59 reports infinite re-renders on the home page. The reporter traced it via React Profiler to a Context Provider creating new object references per render - this is the classic unmemoized context value pattern.

ActiveThemeProvider wraps the entire app in the root layout (app/layout.tsx), so every render of that provider triggers a re-render of every consumer in the tree. Wrapping the value in useMemo maintains referential equality and breaks the render loop.

Changes

• apps/www/components/active-theme.tsx - wrap { activeTheme, setActiveTheme } in useMemo
• apps/www/components/block-viewer.tsx - wrap context value object in React.useMemo

Testing

• pnpm run typecheck passes
• Build and lint failures are pre-existing on main (unrelated /radio page data collection error)

Fixes #59

This contribution was developed with AI assistance (Claude Code).

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