Add CMD-K menu to navigate the app

[arjunkomath]

Summary

• add a global Cmd/Ctrl+K navigation menu and responsive dashboard header trigger
• lazy-load an authenticated catalog of dashboard, project, environment, service, and server pages
• cache results in SWR memory and provide grouped loading, empty, and retry states
• exclude deleted services and cover catalog/API behavior with focused tests

Testing

• pnpm exec vitest run tests/navigation.test.ts tests/navigation-route.test.ts
• ./node_modules/.bin/tsc --noEmit
• full web suite: 334 tests passed before the final rebase

Basecamp

https://app.basecamp.com/5890597/buckets/47439993/todos/10149708222

[github-actions]

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_{Reviewed by React Doctor for commit 5a4d135.}