feat(workflow-form): show the chosen results #8024

Task Summary

Show the results the author chose, as a display filter over the workflow's view-result set.

• One result card per shown operator: a paginated table, a fit-to-card visualisation with per-result zoom, or a compact "no result yet" line for a step that produced nothing.
• The picker is built only from operators the canvas already views (getOperatorsToViewResult); the form's resultOperatorIds picks which of those to display. It NEVER changes the canvas's view-result set (settled design; syncViewResultOperators was removed in PR4).
• Add WorkflowResultService.hasNonEmptyResult so an empty (zero-tuple) result reads as "no result".

Inspecting a step read-only is split out to #8025.

Task Type

• Other