feat(docs): add Smart Accounts reference documentation and update sidebar

Author: fassko

docs/smart-accounts/4-reference.mdx

@@ -0,0 +1,38 @@
+---
+title: Smart Accounts Reference
+description: Solidity reference for Flare Smart Accounts smart contracts.
+keywords:
+  [solidity, reference, smart-accounts, xrpl, flare-network, smart-contracts]
+---
+
+import DocCardList from "@theme/DocCardList";
+import SmartAccountsReference from "@site/src/features/SmartAccounts/Reference";
+
+## Deployed Contracts
+
+<SmartAccountsReference />
+
+:::info
+The `MasterAccountController` address should be retrieved programmatically from the [Flare contracts registry](/network/guides/flare-contracts-registry) rather than hardcoding it, as it may change across network deployments.
+:::
+
+## References
+
+Smart contract interfaces for interacting with the Flare Smart Accounts system.
+
+<DocCardList
+  items={[
+    {
+      type: "link",
+      label: "IMasterAccountController",
+      href: "/smart-accounts/reference/IMasterAccountController",
+      docId: "smart-accounts/reference/IMasterAccountController",
+    },
+    {
+      type: "link",
+      label: "IPersonalAccount",
+      href: "/smart-accounts/reference/IPersonalAccount",
+      docId: "smart-accounts/reference/IPersonalAccount",
+    },
+  ]}
+/>