Pictures paint with the page: column-sized copies, and CORS that works

Measured in the live tab (screencast frames): back from a profile, the
feed's text was on screen ~200ms before its photo. The <img> was loaded
and complete on the first frame — a 3024px, 12-megapixel original that
Chrome re-decodes whenever the page is rebuilt.

- Post photos wider than the column at 2x are painted from an 1100px
  WebP copy made once (fetch, createImageBitmap, OffscreenCanvas) and
  kept in Cache Storage; it decodes in a few ms, decoding=sync, inside
  the same frame as the text. GIFs and small pictures keep the original;
  the lightbox opens the original. Profile banners use the same copies,
  warmed on prefetch.
- corsFetch: primal's CDN caches its no-Origin answer without
  Vary: Origin, so a CORS fetch after the <img> got that header-less copy
  and failed — which had written blossom.primal.net, m.primal.net and
  coinos.io off as 'no CORS', so their avatars never got local
  thumbnails and painted late from the originals. A refusal is now
  retried once past the cache before a host is blamed; the old list is
  dropped (nocors-v2).
- DM list: the unread dot sits centred at the row's end, like the
  communities' below, instead of beside the time.
- Balance card gear: the icon alone, no circle.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01Dmcrt9KyNDKVWFKnb8BREo

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