feat: replace option-like arrays via conditionals

[danielcardoso5]

Matches v0 behavior by allowing to override option-like arrays present in oneOf / anyOf properties. This allows to change the list of options allowed for fields based on conditionals.

Example:

Schema

{
    "type": "object",
    "additionalProperties": false,
    "properties": {
        "trigger": {
            "type": "string"
        },
        "choice": {
            "type": "string",
            "oneOf": [
                {
                    "const": "a",
                    "title": "A"
                },
                {
                    "const": "b",
                    "title": "B"
                },
                {
                    "const": "c",
                    "title": "C"
                }
            ]
        }
    },
    "allOf": [
        {
            "if": {
                "properties": {
                    "trigger": {
                        "const": "only c"
                    }
                },
                "required": [
                    "trigger"
                ]
            },
            "then": {
                "properties": {
                    "choice": {
                        "oneOf": [
                            {
                                "const": "c",
                                "title": "C"
                            }
                        ]
                    }
                }
            }
        }
    ]
}

Before	After

---

Note

Medium Risk
Changes core schema merge logic used when applying conditionals and updating fields; wrong array handling could break validation or option lists across many forms.

Overview
deepMergeSchemas now fully replaces schema arrays when a conditional branch supplies new values—except required, which still only appends missing entries. That replaces the old behavior that special-cased options and tried to merge array contents (including a buggy recursive merge on object items).

Conditional allOf / if / then merges can therefore narrow or swap field choices: oneOf, anyOf, enum, and presentation options update on validation and revert when the branch is inactive, with validation aligned to the active set.

Tests cover deepMergeSchemas edge cases, convertKBToMB, and headless-form scenarios for conditional oneOf, anyOf, and enum.

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[danielcardoso5]

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