Two related bugs around the web-images section:
1. Fast typing produced overlapping fetches where a late 'do' response
could overwrite results for 'donald trump'. Stamp each request with
a generation id in a component-local atom and drop responses whose
id no longer matches.
2. The section unmounted during transition states — while the parent's
debounced query hadn't caught up yet, or after the user typed but
before loading? flipped to true — so the layout below jumped up,
then back down when skeletons appeared. Compute a pending? flag
from both conditions, keep the section mounted whenever loading? or
pending?, and mirror avatar-mode on skeletons so circle-mode loads
land in the exact spot the circular skeletons occupied. CSS mirror
the same geometry (transparent 2px border + avatar-mode 50% radius)
on .web-image-placeholder.
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