fix(sdk): readonly mode is overridden by the UI schema rule

[szymon-t-sc]

Before

Nagranie.z.ekranu.2026-08-26.o.09.42.20.mov

After

Nagranie.z.ekranu.2026-08-26.o.09.58.42.mov

Reason

"rule" changes the default "enable" to true.

      type: 'HorizontalLayout',
      elements: [
        { type: 'Label', text: 'Number of retries' },
        {
          type: 'Text',
          scope: scope('properties.sendEmail.properties.retries'),
          rule: {
            effect: 'DISABLE',
            condition: {
              scope: scope('properties.sendEmail.properties.retryOnFailure'),
              schema: { const: false },
            },
          },
        },
      ],