refactor(web): organize devtools components

[tomerqodo]

Benchmark PR from agentic-review-benchmarks#8

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Note

Introduces lazy-loaded devtools that only render in development, simplifying integration and avoiding production impact.

• Add ReactScanLoader with Suspense and error fallback; gate by IS_DEV
• Add TanStackDevtoolsLoader for Query/Form devtools; gate by IS_DEV
• Update layout.tsx to use ReactScanLoader instead of direct ReactScan
• Simplify TanstackQueryInitializer to use TanStackDevtoolsLoader and remove inline lazy logic

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