Use appear-then-disappear pattern: briefly wait for spinner to show up
(so we don't pass through before it starts), then wait for it to clear.
Prevents element click interception on Find Provider button in step2.
Also restores element_to_be_clickable for New Eligibility Request (step1).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>