Pagination state is lost when navigating back from single post view #385

Description

In the Web Demo module of the Quantum PHP Framework (QF project), pagination state is not preserved when navigating between the post list and a single post view.

Current Behavior

• Open the paginated list of posts in the web demo module.
• Navigate to any page other than the first (e.g. page 2 or 3).
• Click on a post to view its single post page.
• Use the back arrow (or back navigation provided by the UI) to return to the post list.

Result:

The post list always resets to page 1, and the previously selected pagination page is lost.

Expected Behavior

When returning from a single post view back to the post list, the application should restore the same pagination state (page number and related parameters) that the user was previously on.

Proposed Solution (State-Preserving Back Navigation)

To preserve pagination and search state when navigating between the list and a single post, the list view should pass its current state to the post view in an encoded form.

When rendering links to posts, the list page should:

• Collect the current list state (e.g. page, search, sort, filters)
• Serialize it into a small JSON object
• Encode it using Base64 (URL-safe)
• Attach it to the post URL as a from parameter

Example conceptually:

/post/{uuid}?from=<base64-encoded-state>

The single post page should then:

• If from is present, decode it and reconstruct the original list URL for the “Back” button
• If from is missing (direct visit, bookmark, external link), fall back to the default list URL

Assume the user is on:

/posts?page=3&search=shoose&sort=latest

The list state is represented as JSON:

{
  "page": 3,
  "search": "laravel",
  "sort": "latest"
}

That JSON is then Base64-encoded into something like:

eyJwYWdlIjozLCJzZWFyY2giOiJsYXJhdmVsIiwic29ydCI6ImxhdGVzdCJ9

So the post link becomes:

/post/42?from=eyJwYWdlIjozLCJzZWFyY2giOiJsYXJhdmVsIiwic29ydCI6ImxhdGVzdCJ9