Push HMR updates before the SSR rebuild in dev

Client-only edits are sent to the browser right after the hydration build,
without re-running server functions; SSR rebuilds afterwards and props are
re-fetched only when a .server.ts output changed or after fullRebuild. Page
requests wait for an in-flight SSR rebuild. The SSR build no longer runs
Tailwind, the PostCSS processor is reused across rebuilds, and the watcher
debounce drops from 200ms to 50ms.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

dist/functions/bundler/pages-ssr-context-bundler.d.ts

@@ -15,4 +15,9 @@ type RebuildParams = {
  * hydration context rebuild, which re-enters this queue).
  */
 export default function enqueueSSRRebuild(params?: RebuildParams): Promise<void>;
+/**
+ * Resolves once the in-flight SSR rebuild (if any) has finished. Lets page
+ * requests avoid rendering stale SSR modules against a newer client bundle.
+ */
+export declare function awaitSSRRebuild(): Promise<void>;
 export {};