update confidential changelog (#102)

Author: arr00

content/confidential-contracts/changelog.mdx

@@ -2,6 +2,29 @@
 title: Changelog
 ---
 
+<a id="v0.3.0"></a>
+# [v0.3.0](https://github.com/OpenZeppelin/openzeppelin-confidential-contracts/releases/tag/v0.3.0) - 2025-11-28
+
+- Migrate `@fhevm/solidity` from v0.7.0 to 0.9.1 ([#202](https://github.com/OpenZeppelin/openzeppelin-confidential-contracts/pull/202), [#248](https://github.com/OpenZeppelin/openzeppelin-confidential-contracts/pull/248), [#254](https://github.com/OpenZeppelin/openzeppelin-confidential-contracts/pull/254))
+
+### Token
+
+- Rename all `ConfidentialFungibleToken` files and contracts to use `ERC7984` instead. ([#158](https://github.com/OpenZeppelin/openzeppelin-confidential-contracts/pull/158))
+- `ERC7984`: Change `tokenURI()` to `contractURI()` following change in the ERC. ([#209](https://github.com/OpenZeppelin/openzeppelin-confidential-contracts/pull/209))
+- `ERC7984`: Support ERC-165 interface detection on ERC-7984. ([#246](https://github.com/OpenZeppelin/openzeppelin-confidential-contracts/pull/246))
+- `IERC7984`: Change `tokenURI()` to `contractURI()` following change in the ERC. ([#209](https://github.com/OpenZeppelin/openzeppelin-confidential-contracts/pull/209))
+- `IERC7984`: Support ERC-165 interface detection on ERC-7984. ([#246](https://github.com/OpenZeppelin/openzeppelin-confidential-contracts/pull/246))
+- `ERC7984Omnibus`: Add an extension of `ERC7984` that exposes new functions for transferring between confidential subaccounts on omnibus wallets. ([#186](https://github.com/OpenZeppelin/openzeppelin-confidential-contracts/pull/186))
+- `ERC7984ObserverAccess`: Add an extension for ERC7984, which allows each account to add an observer who is given access to their transfer and balance amounts. ([#148](https://github.com/OpenZeppelin/openzeppelin-confidential-contracts/pull/148))
+- `ERC7984Restricted`: An extension of `ERC7984` that implements user account transfer restrictions. ([#182](https://github.com/OpenZeppelin/openzeppelin-confidential-contracts/pull/182))
+- `ERC7984Freezable`: Add an extension to `ERC7984`, which allows accounts granted the "freezer" role to freeze and unfreeze tokens. ([#151](https://github.com/OpenZeppelin/openzeppelin-confidential-contracts/pull/151))
+- `ERC7984Rwa`: An extension of `ERC7984`, that supports confidential Real World Assets (RWAs). ([#160](https://github.com/OpenZeppelin/openzeppelin-confidential-contracts/pull/160))
+
+### Utils
+
+- `FHESafeMath`: Add `tryAdd` and `trySub` functions that return 0 upon failure. ([#206](https://github.com/OpenZeppelin/openzeppelin-confidential-contracts/pull/206))
+- `FHESafeMath`: Support non-initialized inputs in `tryIncrease(..)`/`tryDecrease(..)`. ([#183](https://github.com/OpenZeppelin/openzeppelin-confidential-contracts/pull/183))
+
 <a id="v0.2.0"></a>
 # [v0.2.0](https://github.com/OpenZeppelin/openzeppelin-confidential-contracts/releases/tag/v0.2.0) - 2025-08-15