Add relative positioning to history preview (#9557)

In the history page component, the `.history-view__preview` class
was updated to include the `position: relative` CSS property. This
change is necessary to ensure that the preview displays as
intended within its container. 

- Improved layout handling by setting `position: relative`.
- Ensures that child elements of the preview position correctly
 without breaking the layout flow.

Author: PavelLaptev

apps/desktop/src/routes/[projectId]/history/+page.svelte

@@ -344,6 +344,7 @@
 	/* PREVIEW */
 	.history-view__preview {
 		display: flex;
+		position: relative;
 		flex: 1;
 		flex-direction: column;
 		overflow: hidden;