[dynamicIO] Fix dev warmup (#77829)

When `dynamicIO` is enabled, we're triggering a warmup request in dev mode. This ensures that replayed logs are associated with the correct environment (`Prerender` vs. `Server`), by seeding the caches before the actual render.

This PR fixes two issues with the dev warmup:
- Ensures that cache keys are identical between the warmup, the subsequent dynamic render, and the dynamic validation, by providing the HMR refresh hash (part of the cache key) for all dev render phases.
- Ensures that stale cache entries are discarded during the warmup, by providing the implicit tags also during the warmup (and the dynamic validation).

Author: unstubbable

packages/next/src/client/components/app-router-headers.ts

@@ -12,6 +12,7 @@ export const NEXT_ROUTER_PREFETCH_HEADER = 'Next-Router-Prefetch' as const
 export const NEXT_ROUTER_SEGMENT_PREFETCH_HEADER =
   'Next-Router-Segment-Prefetch' as const
 export const NEXT_HMR_REFRESH_HEADER = 'Next-HMR-Refresh' as const
+export const NEXT_HMR_REFRESH_HASH_COOKIE = '__next_hmr_refresh_hash__' as const
 export const NEXT_URL = 'Next-Url' as const
 export const RSC_CONTENT_TYPE_HEADER = 'text/x-component' as const
 

packages/next/src/client/components/react-dev-overlay/app/hot-reloader-client.tsx

@@ -46,6 +46,7 @@ import type { GlobalErrorComponent } from '../../error-boundary'
 import type { DevIndicatorServerState } from '../../../../server/dev/dev-indicator-server-state'
 import reportHmrLatency from '../utils/report-hmr-latency'
 import { TurbopackHmr } from '../utils/turbopack-hot-reloader-common'
+import { NEXT_HMR_REFRESH_HASH_COOKIE } from '../../app-router-headers'
 
 export interface Dispatcher {
   onBuildOk(): void
@@ -412,7 +413,7 @@ function processMessage(
 
       // Store the latest hash in a session cookie so that it's sent back to the
       // server with any subsequent requests.
-      document.cookie = `__next_hmr_refresh_hash__=${obj.hash}`
+      document.cookie = `${NEXT_HMR_REFRESH_HASH_COOKIE}=${obj.hash}`
 
       if (RuntimeErrorHandler.hadRuntimeError) {
         if (reloading) return