* fix(form-builder): show default label when field label is only whitespace
* fix: add validation to ensure label is not empty or whitespace
* fix: enhance label validation to prevent empty or whitespace labels in FormBuilder
* fix: refactor label validation in FormBuilder to streamline whitespace checks
* chore: retrigger CI (flaky vitest worker shutdown)
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Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>