[e-cline]

What and why

RPC answers now bring their stylesheets. Before, RpcServer encoded an RPC's result without Render's styles, so an element it returned (weft_shop's "Load more" cards) was styled only by the sheets the page had already loaded: a class from any other sheet showed unstyled. This is follow-up 1 of docs/weft_css_plan.md, now marked done with an "As built" note.

weft_server

• RpcServer.respond takes ~assets (virtual:weft/assets, as Page.respond does), and encodes the answer with their styles: the C rows of what it renders go before the rows needing them, as in a page's payload. Without ~assets, nothing changes.
• The client needed nothing: Rpc.call decodes with Decoder.valueFromStream, which already holds the root back until its sheets load. So the call resolves only once they have, and whatever the caller renders with the answer is styled; a later row (a card's stock) waits as any other does.
• Page.stylesOf is public: the stylesheets in an app's assets, as Render takes them.
• The assets go to respond rather than router, so the module listing the handlers needn't import them.

Examples

• weft_shop and weft_notes pass ~assets to their RPC route.
• weft_shop's product cards have a sale badge ("20% off") in a file of its own (SaleBadge), with its own sheet, which a page sends only if something on it is on sale.

Testing

• weft_server's Sheets_test, "RPCs, with sheets": through the router in process, an answer whose element has a class from an unloaded sheet is held back until that sheet loads; a boundary in an answer keeps its fallback, after the call has resolved, until its later row's sheet loads; without assets, no sheets are sent and nothing waits. The first two fail with the styles left out.
• weft_shop's Styles_test: shoes sorted dearest first have nothing on sale on the first page, so the badge's sheet isn't loaded; with it held, "Load more" keeps the grid as it was ("Loading…") until the sheet loads, then shows the cards with their badges, and WeftTesting.unstyled is empty at every step. With ~assets taken out of the route it fails: the cards show at once, unstyled.

Checklist

• pnpm run check, pnpm run test and pnpm run e2e pass (the flash test in Chromium, Firefox and WebKit)
• Tests cover the change
• A changeset is included (pnpm changeset) if a published package changed

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