Hedera Account Service (HAS) Precompile `hbarAllowance` Returns Original Instead of Live Remaining Allowance

# Issue: Hedera Account Service (HAS) Precompile `hbarAllowance` Returns Original Instead of Live Remaining Allowance

## Problem

Under [HIP-906](https://hips.hedera.com/hip/hip-906#hip-906), the Hedera Account Service (HAS) system contract precompile at `0x16a` exposes functions to query HBAR allowances. However, calls to these functions fail to return the live, decremented remaining allowance after HBAR has been spent by a spender. Instead, they return the originally granted allowance.

This is demonstrated and reproducible using the following MCVE repository:
**MCVE Repository:** [remainign-hbar-allowance-mcve](https://github.com/skurzyp-blockydevs/remainign-hbar-allowance-mcve)

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## Technical Context & HIP-906 Specification

Based on the [HIP-906 Specification](https://hips.hedera.com/hip/hip-906#hip-906):
* **Solidity Signature:** `hbarAllowance(address spender) external returns (int64 responseCode, int256 amount)`
* *(Also applies to the 2-parameter variant: `hbarAllowance(address owner, address spender)`)*

### Expected Behavior:
The response code from the call and the amount of HBAR allowance currently available to the spender must return the **remaining assets (live remaining allowance)**, not the originally given/granted amount.

When a spender uses `cryptoTransfer` via the HTS precompile to spend HBAR on behalf of an owner, the available allowance must decrement accordingly on the consensus state. Any subsequent queries to `hbarAllowance` must reflect this deduction.

### Observed Behavior:
The HAS precompile queries do not correctly reflect the decremented remaining allowance after a spend transaction has occurred, continuing to return the original amount granted.

Reproduce the behavior with the linked remainign-hbar-allowance-mcve repository, then trace the HAS precompile hbarAllowance entry points alongside HTS cryptoTransfer. Compare the queried amount before and after the spender uses the allowance; done means both hbarAllowance variants report the live remaining amount rather than the original grant.

Written by the indexing model from the issue text.