Dashboard: Fix footer not sticked to bottom on short contracts page (#7951)

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## PR-Codex overview
This PR focuses on enhancing the layout of the `contract-page-layout.tsx` component by adding a CSS class to the main `div` element for improved styling and structure.

### Detailed summary
- Changed the main `div` element from `<div>` to `<div className="flex flex-col grow">` to apply flexbox layout and allow the element to grow.

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<!-- This is an auto-generated comment: release notes by coderabbit.ai -->

## Summary by CodeRabbit

* **Style**
  * Updated contract page layout to use a flexible, column-based structure for more consistent spacing.
  * Improves use of available screen space so content expands naturally within the dashboard.
  * Enhances responsiveness across viewports, reducing awkward white space and unnecessary scrolling.
  * Provides more stable alignment between sidebar and main content on contract detail pages.

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Author: MananTank

apps/dashboard/src/app/(app)/(dashboard)/(chain)/[chain_id]/[contractAddress]/_layout/contract-page-layout.tsx

@@ -35,7 +35,7 @@ export function ContractPageLayout(props: {
   } = props;
 
   return (
-    <div>
+    <div className="flex flex-col grow">
       <div className="border-border border-b py-8">
         <div className="container flex flex-col gap-4">
           <div className="flex flex-col justify-between gap-4 md:flex-row">