### What?
Fix `JSON` field so that it respects `admin.editorOptions` (e.g.
`tabSize`, `insertSpaces`, etc.), matching the behavior of the `code`
field. Also refactor `CodeEditor` to set indentation and whitespace
options per-model instead of globally.
### Why?
- Previously, the JSON field ignored `editorOptions` and always
serialized with spaces (`tabSize: 2`). This caused inconsistencies when
comparing JSON and code fields configured with the same options.
- Monaco’s global defaults were being overridden in a way that leaked
settings between editors, making per-field customization unreliable.
### How?
- Updated `JSON` field to extract `tabSize` from `editorOptions` and
pass it through consistently when serializing and mounting the editor.
- Refactored CodeEditor to:
- Disable `detectIndentation` globally.
- Apply `insertSpaces`, `tabSize`, and `trimAutoWhitespace` on a
per-model basis inside onMount.
- Preserve all other `editorOptions` as before.
Fixes#13583
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Co-authored-by: Jarrod Flesch <jarrodmflesch@gmail.com>
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