fix: convert GuardError in staking_rewards rotate_admin

[kaizercodes]

Overview

This PR fixes a compile-blocking type mismatch in contracts/staking_rewards/src/lib.rs. The rotate_admin function declares a return type of Result<(), ContractError>, but DefaultEmergencyGuard::rotate_admin returns Result<(), GuardError>. The guard call is now wrapped with .map_err(|_| ContractError::Paused) so the error type aligns without requiring a broad From<GuardError> for ContractError implementation.

Related Issue

Closes CT-027

Changes

🐛 Staking Rewards Error Conversion

• [MODIFY] contracts/staking_rewards/src/lib.rs
  • Converts the GuardError from DefaultEmergencyGuard::rotate_admin into ContractError::Paused.
  • Keeps the change minimal and consistent with existing contract error conventions.
  • Updated call:

DefaultEmergencyGuard::rotate_admin(...).map_err(|_| ContractError::Paused)?;

Verification Results

cargo check --manifest-path contracts/staking_rewards/Cargo.toml
✅ Compilation succeeds

cargo test --manifest-path contracts/staking_rewards/Cargo.toml
✅ Tests pass

Acceptance Criteria	Status
Add `.map_err(	_
Or implement From<GuardError> for ContractError	✅ Not needed — the focused error conversion satisfies the function signature

Closes #314

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