fix: The back and forward buttons in the navbar are not getting disabled even if being in the last or first page

Description

The Back and Forward buttons in the navbar are not getting disabled when the user reaches the first or last page in the navigation history.

Both buttons remain clickable even when there is no previous or next page available in the history stack.

Steps to Reproduce

Open Rocket.Chat in the browser.

Navigate between different pages (e.g., Home → Channel A → Channel B).

Click the Back button until you reach the first page.

Observe that the Back button is still enabled.

Click the Forward button until you reach the last page.

Observe that the Forward button is still enabled.

Expected Behavior

The Back button should be disabled when the user is on the first page in the navigation history.

The Forward button should be disabled when the user is on the last page in the navigation history.

The buttons should dynamically update based on available navigation history.

Actual Behavior

The Back and Forward buttons remain enabled even when no navigation is possible in that direction.

Clicking them does not perform any action, but they still appear active.

Start by reproducing the issue in Rocket.Chat in a browser, following the navbar Back and Forward controls through a navigation history such as Home → Channel A → Channel B. Trace how the controls determine whether previous or next pages exist; done means each button dynamically appears disabled at the corresponding history boundary and remains usable otherwise.