Feature Request: News Widget – define a default image for items without an image

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Feature request

Which Nextcloud Version are you currently using: (see administration page)
33
Is your feature request related to a problem? Please describe.
When a news item/new page has no image selected, its tile/list entry renders text-only, leaving a large amount of empty white space. This looks unpolished, especially in tile view.

Describe the solution you'd like
Allow a default/fallback image to be configured (e.g. at widget or instance level) that's automatically used whenever a news item has no image assigned, instead of leaving the tile empty.

Describe alternatives you've considered

Additional context

No files or tests are named. Start by locating the News widget's tile and list rendering and the existing image-selection or widget-configuration entry points; done means items without an image consistently display the configured fallback image without changing items that already have one.