fix(codegen): preserve string values in generated JSX

[KennyMcSimpson]

Closes #379.

String props are escaped as JavaScript strings, but serializeProps() currently places them in quoted JSX attributes. A value such as Quoted "temperature" then produces invalid TSX. Backslashes and newlines can also compile to a different value.

Emit string props as JSX expressions, so the existing JavaScript escaping is interpreted correctly: title={"Quoted \"temperature\""}.

The tests compile the generated TSX and evaluate its props for both quote modes. They cover quotes, apostrophes, line breaks, tabs, backslashes, entities, and empty strings. Boolean shorthand and nullish prop handling are covered as well. The package docs, web reference, skill examples, and codegen page's documentation parity hashes are updated to match the output.

Testing

• pnpm exec vitest run packages/codegen/src/serialize.test.ts packages/codegen/src/traverse.test.ts — 13 tests passed.
• pnpm type-check — passed across all 60 tasks.
• pnpm --filter @json-render/codegen typecheck — passed.
• Prettier check passed for the changed TypeScript files and documentation fixture.
• Documentation hashes were checked with the existing Markdown converter.

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