- AttachmentDownloadPill: bring back the optional adaptive sizing
branch (default off). When the host sets containerType: inline-size,
the pill scales 22-30px with the tile width using a steeper
18cqw curve, so two-image tiles already reach 30px while tiny
thumbs in mixed layouts stay at 22px.
- AlbumBubble: opt every tile into adaptive sizing and add the query
container so the cqw units resolve against each tile's width.
- Single-image and video bubbles continue to render the pill at a
fixed 30px (no host opt-in needed).
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