Cannot change default linkType to internal in Lexical

[cbratschi]

Describe the Bug

I tried this code to modify the order of the radio buttons and to set the default linkType to 'internal':

                            const fields = defaultFields.map(field => {
                                //modify link type
                                if (field.name === 'linkType') {
                                    const radio = field as RadioField;

                                    return <RadioField>{
                                        ...radio,

                                        //use internal by default
                                        defaultValue: 'internal',

                                        //change order
                                        options: [
                                            radio.options[1],
                                            radio.options[0]
                                        ]
                                    };
                                }

                                return field as Field;
                            });

However, Payload always uses 'custom' as default value:

https://github.com/payloadcms/payload/blob/main/packages/richtext-lexical/src/features/link/markdownTransformer.ts#L39

Most of our links are internal and it would be much better to start with an internal link.

Link to the code that reproduces this issue

https://github.com/cbratschi/payload

Reproduction Steps

See above.

Which area(s) are affected? (Select all that apply)

plugin: richtext-lexical

Environment Info

Binaries:
  Node: 22.12.0
  npm: 10.9.0
  Yarn: 1.22.22
  pnpm: N/A
Relevant Packages:
  payload: 3.13.0
Operating System:
  Platform: darwin
  Arch: arm64
  Version: Darwin Kernel Version 24.1.0: Thu Oct 10 21:05:23 PDT 2024; root:xnu-11215.41.3~2/RELEASE_ARM64_T6031
  Available memory (MB): 65536
  Available CPU cores: 16

[github-actions]

🚀 This is included in version v3.16.0

[github-actions]

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