Update settings

<small>Requires the settings:write scope (or a broader one that includes it).</small>

Performs a sparse update of settings. Only properties present in the request body are updated — omitted properties are left unchanged.

Nested sections follow the same rule: include only the fields you want to change within each section.

Contact stages and account stages are an exception — when the contactStages or accountStages array is present, all 8 stages must be provided with unique IDs (1–8).