Redesign listing cards around the image's real aspect ratio

[AndrewG828]

Stacked PR 3 of 15. Based on #112 — merge in order.
#111 → #112 → #113 → #114 → #115 → #116 → #117 → #118 → #119 → #120 → #121 → #122 → #123 → #124 → #125

Feed cells were locked to a 4:3 box, so tall and square photos were cropped to
whatever fit. CachedImageView now reports the decoded image's aspect ratio
back to its caller, and ProductGalleryCell sizes the image from it — falling
back to 4:3 only while loading. Cells are wider (46pt of chrome instead of 68)
and the column gap tightened to match.

The cell also gains the information the old one dropped: category and condition
under the title, and a bookmark toggle that saves without opening the listing.

loadSavedState() only asks the server about a single post while
HomeViewModel.savedItems hasn't loaded yet. savedItems holds every saved
post, so once it has arrived, absence is a real answer — the naive version fired
one /post/isSaved request per visible cell on every scroll. That needed
hasLoadedSavedItems on HomeViewModel to distinguish "not saved" from
"not known yet".

CategoriesView is extracted as its own component: the Shop By Category row is
about to be used by Explore, and it is the same row Home already shows.

Co-Authored-By: Claude Opus 5 (1M context) noreply@anthropic.com
Claude-Session: https://claude.ai/code/session_017R8mua9xepzF3mnRETtd6W

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