doc: add theme keyboard shortcut

[TheOrcDev]

Summary

• add a global d keyboard shortcut through Next.js client instrumentation
• delegate light/dark changes to Fumadocs' existing theme controls
• ignore editable targets, modified keypresses, prevented events, and key repeats

Why

This keeps Fumadocs as the single owner of theme state and persistence while adding keyboard access without another theme provider, a direct next-themes dependency, or React effect lifecycle code.

Testing

• pnpm --filter docs test (11 test files, 95 tests)
• Prettier check for src/instrumentation-client.ts
• isolated TypeScript check for src/instrumentation-client.ts

Breaking changes

None.

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Project	Deployment	Actions	Updated (UTC)
nuqs	Ready	Preview	Aug 7, 2026 10:14pm

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