Android: Fix chats menu not dismissing when NTP is shown

[karlenDimla]

Task/Issue URL: https://app.asana.com/1/137249556945/project/488551667048375/task/1215828353176637?focus=true
Tech Design URL (if applicable):

Description

What: Dismiss the chats popup menu in onStop(), clearing the reference via its dismiss listener.

Why: The popup is a standalone window not tied to the sheet's lifecycle. When the NTP is shown, the popup is left open. The simplest solution is to hide the icon when the tab loses focus.

Steps to test this PR

• Ensure that you set the inactivity timer to Always (for easy testing)
• Ensure you have some recent chats (to guarantee the menu from showing)
• Open an article on one tab
• Select contextual sheet
• Click on the chats icon
• Verify chats popup menu is shown
• Background the app / also try closing the screen
• Come back to the app
• Verify the NTP page is shown AND the chats menu is NOT shown.
• Go back to the tab
• Verify contextual sheet is open and chats menu still works

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Note

Low Risk
Small UI lifecycle change in one fragment; no auth, data, or business-logic impact.

Overview
Fixes the contextual Duck AI chats menu staying on screen when the user navigates away (e.g. opening the NTP) while the popup is open.

DuckChatContextualFragment now keeps a reference to the active PopupMenu, clears it on dismiss, and calls dismiss() in onStop() so the overlay is torn down when the fragment is no longer visible.

^{Reviewed by Cursor Bugbot for commit 697e087. Bugbot is set up for automated code reviews on this repo. Configure here.}

[karlenDimla]

• Android: Fix chats menu not dismissing when NTP is shown #8963 👈 (View in Graphite)
• develop

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