fix(adapter): transforms output back to Date for better-auth compat#236

tomsiwik wants to merge 1 commit intoget-convex:mainget-convex/better-auth:mainfrom

tomsiwik:fix/invitation-date-number-conversion-customTransformOutputtomsiwik/convex-dev-better-auth:fix/invitation-date-number-conversion-customTransformOutputCopy head branch name to clipboard