[anurag629]

Two follow-ups to #521:

• theme.tokens takes surface-raised, the header menu's background, which feat(widget): add header menu with conversation and privacy options #505 added after feat(widget): add typed theme token overrides #521 branched. It's in TOKEN_NAMES and in the token table in theming.mdx (#ffffff light, #1e1e1e dark, from launcher.css). Patch changeset, API snapshot updated.
• The single-file budget goes from 22 to 23 kB. The single file inlines every chunk, so it carries the header menu (feat(widget): add header menu with conversation and privacy options #505), the tokens (feat(widget): add typed theme token overrides #521) and soon copy (feat(widget): add copy action to completed replies #504). It's at 21.67 kB on dev, and feat(widget): add copy action to completed replies #504 adds about 0.38 kB, which would put it just over 22. The loader (4.8 of 5 kB) and the panel (19 kB) stay as they are. CONTRIBUTING has the number.

How I tested this

• pnpm -r build, pnpm api:check (10 packages up to date), widget tests (823 pass), pnpm docs:check, pnpm size (all within limits) and pnpm lint (38) pass.