Show 404 on invalid contract address in contract page (#5140)

## Problem solved

Short description of the bug fixed or feature added

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## PR-Codex overview
This PR enhances the `Layout` component by adding a validation check to ensure that the `contractAddress` parameter is a valid address using `isAddress`. If the address is invalid, it returns a "not found" response.

### Detailed summary
- Imported `isAddress` from `thirdweb/utils`.
- Added a check to validate `props.params.contractAddress` using `isAddress`.
- If the address is invalid, the function returns `notFound()`.

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Author: MananTank

apps/dashboard/src/app/(dashboard)/(chain)/[chain_id]/[contractAddress]/layout.tsx

@@ -5,7 +5,7 @@ import { DeprecatedAlert } from "components/shared/DeprecatedAlert";
 import type { Metadata } from "next";
 import { notFound } from "next/navigation";
 import { getContractMetadata } from "thirdweb/extensions/common";
-import { isContractDeployed } from "thirdweb/utils";
+import { isAddress, isContractDeployed } from "thirdweb/utils";
 import { resolveFunctionSelectors } from "../../../../../lib/selectors";
 import { shortenIfAddress } from "../../../../../utils/usedapp-external";
 import { ConfigureCustomChain } from "./ConfigureCustomChain";
@@ -22,6 +22,10 @@ export default async function Layout(props: {
   };
   children: React.ReactNode;
 }) {
+  if (!isAddress(props.params.contractAddress)) {
+    return notFound();
+  }
+
   const info = await getContractPageParamsInfo(props.params);
 
   if (!info) {