refactor: supply parameters to include decimals

Author: heueristik

src/XanV1.sol

@@ -250,7 +250,7 @@ contract XanV1 is IXanV1, Initializable, ERC20Upgradeable, ERC20BurnableUpgradea
     /// @custom:oz-upgrades-unsafe-allow missing-initializer-call
     // solhint-disable-next-line func-name-mixedcase
     function __XanV1_init_unchained(address initialMintRecipient) internal onlyInitializing {
-        _mint(initialMintRecipient, Parameters.SUPPLY * 10 ** decimals());
+        _mint(initialMintRecipient, Parameters.SUPPLY);
     }
 
     /// @inheritdoc ERC20Upgradeable

src/libs/Parameters.sol

@@ -2,11 +2,11 @@
 pragma solidity ^0.8.30;
 
 library Parameters {
-    /// @notice The total supply of the token amounting to 1 bn (10^9).
-    uint256 internal constant SUPPLY = 1_000_000_000;
+    /// @notice The total supply amounting to 1 bn (10^9) tokens with 18 decimals.
+    uint256 internal constant SUPPLY = 10 ** (9 + 18);
 
     /// @notice The minimal locked supply required for upgrades amounting to 25% of the total supply.
-    uint256 internal constant MIN_LOCKED_SUPPLY = 250_000_000;
+    uint256 internal constant MIN_LOCKED_SUPPLY = SUPPLY / 4;
 
     /// @notice The quorum ration numerator.
     uint256 internal constant QUORUM_RATIO_NUMERATOR = 1;