Clear query cache on sign-out to prevent stale cross-user data

[coderabbitai]

Description

Currently, the authentication event handler in src/App.tsx always calls queryClient.invalidateQueries() for all Clerk events. This can leave stale data from a previous user briefly visible after sign-out.

Proposed Enhancement

Update the implementation to:

• Pass the full Clerk event to the callback (modify useOnClerkEvent hook)
• Branch on event type in the callback:
  • Use queryClient.clear() for sign-out/session invalidation events
  • Use queryClient.invalidateQueries() for other auth events

This will ensure the cache is completely cleared on sign-out while maintaining normal invalidation for other authentication state changes.

Context

This enhancement was identified during the review of PR #184 which implements basic query cache invalidation on auth changes.

Related:

• PR: invalidate query cache on auth change #184
• Review Comment: invalidate query cache on auth change #184 (comment)

Requested by: @narthur