Consolidate JSON editors to Monaco

[guan404ming]

Why

The UI bundled three separate editor libraries (CodeMirror, react-json-view, Monaco) for JSON editing and display, adding unnecessary dependency weight.

How

• Replace CodeMirror-based JsonEditor and react-json-view-based RenderedJsonField with Monaco
• Remove @codemirror/lang-json, @uiw/codemirror-themes-all, @uiw/react-codemirror, and react-json-view dependencies
• Update all consumer components to use the new prop interfaces

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Was generative AI tooling used to co-author this PR?

• Yes (please specify the tool below)
  Claude Code with Opus 4.6

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