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fix(csp): prevent authentication for zero-weight voters

Add validation to reject authentication attempts from users with zero
weight in weighted censuses. Users with zero weight should not be able
to participate in the voting process as they have no voting power.

Changes:
- Add check in authFirstStep to return ErrZeroWeightVoter when a user
  has zero weight in a weighted census
- Add test case "User with Phone Only" to verify zero-weight users
  cannot authenticate and receive empty auth tokens

This ensures data integrity by preventing invalid voting attempts from
users who should not have voting privileges.