Indicate “Made for elementary OS” apps directly in the listing view

### Problem

When browsing AppCenter, there’s currently no easy way to tell which apps are made specifically for elementary OS and which are generic Flatpak apps (often designed for GNOME or other desktops).

While the app details page includes a badge, this information isn’t visible in the search results or app listing view.

> Made for elementary OS
> Reviewed by elementary for security, privacy, and system integration

For users who value elementary’s visual and UX consistency, this makes discovery more difficult. Personally, I try to choose apps built with libgranite or following elementary’s design guidelines, and I’d rather support native apps — even paid ones — over non-native alternatives. Right now, to do that, I have to open each app individually to check whether it’s “Made for elementary OS.”

### Proposal

Add a “Made for elementary OS” indicator (badge, icon, or label) directly in the AppCenter’s list and search views, so users can identify native elementary apps at a glance.

This could be a small badge next to the app name or publisher, similar to how verified or curated apps are marked in other stores.

Additionally, this could later integrate with a filtering system to show only “Made for elementary OS” apps — though that could be a separate feature request.

### Prior Art (Optional)

_No response_