refactor(sidebar): Adjust spacing for new chat ChatGPT button

- Add some space below the "NEW CHAT" button in the sidebar

Changes summary:
- Adjusted the spacing below the "NEW CHAT" button in the sidebar to improve layout balance and visual hierarchy within the sidebar section.

src/sass/elements/_sidebar.scss

@@ -12,6 +12,7 @@
 		border: 2px solid var(--c-surface-2);
 		padding: var(--p-sidebar-nav-a-new-chat) !important;
 		text-transform: uppercase;
+		margin-bottom: 1rem !important;
 
 		/* NEW CHAT svg icon */
 		button > svg {