feat(web): align the model catalog with the pi-ai provider form

Both editors live in `ui-models` and list the same thing, so they now share
one row shape rather than diverging when #1368 lands: a bordered entry per
model, id and display name on the row, and the capacities behind the row's
own disclosure. The context window is joined there by the per-model output
cap the adapter just gained; both read a decimal K/M suffix.

The shared class names carry this file's token spellings, not that branch's.
`--dsw-alias-border-subtle`, `--dsw-alias-text-tertiary`, and
`--dsw-alias-text-primary` are undeclared, so they resolve to the light-mode
literals in their fallback slots — the defect this section was moved off. A
styles test now rejects any `--dsw-*` name the token sheet does not declare,
so the next editor to name one fails instead of shipping a light-only
surface.

The keystroke buffer is now per capacity field rather than per row, since a
row holds two of them.

packages/client/ui-models/README.i18n.yaml

@@ -2,5 +2,5 @@
 # side as of the last confirmed-consistent state. Both languages carry equal authority;
 # after editing either side, bring the other along and re-record with:
 #   pnpm run verify-translation-pairing --write packages/client/ui-models/README.md
-README.md: 6ce66b5e0614fc2b6820c5d95f294fcc1a30d4de
-README.zh.md: 0a28aa627d4d0c8dd54cffe690d334d4e10fa69d
+README.md: d403b15247173e6290214eeae7a401851e835700
+README.zh.md: adb37bb25420bf4e038153ba8a5c213b8a993791