landing: regen privacy hero with recognizable webcam silhouette

Previous render produced a flat puck-shaped object that didn't read
as a webcam — flat profile, no visible lens, looked more like a
hockey puck or smart-home button.

Beefed up the secondary_subject spec: explicit Logitech-C920 / Razer
Kiyo silhouette, prominent round glass lens with chrome ring as the
dominant feature, mic holes flanking the lens, fold-out clip stand
underneath.  Plus a `what_this_does_NOT_look_like` enumeration in
the spec and matching items in the negative prompt
(NOT a hockey puck, NOT a flat disc, NOT a smart-home button,
lens MUST be visible and dominant).

New render: unambiguous webcam silhouette + still ONE cable + same
brand aesthetic intact (purple bokeh, wood desk, green Pi LED).

Author: Sbussiso