docs(react): document the Next.js App Router SSR setup#995
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The SSR guide only covered the Pages Router (_document, one-shot). Add an App Router section using useServerInsertedHTML, and explain why the renderer must be cleared after each streaming flush: renderToStyleElements returns the renderer's entire accumulated CSS on every call, so without clearing, Next duplicates the full stylesheet into <body> on later flushes. Those stale copies override head-inserted styles after a client-side navigation, making makeStyles overrides lose to their makeResetStyles base. Also clarifies the existing heading as 'Next.js (Pages Router)'.
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The SSR guide only covered the Pages Router (_document, one-shot). Add an App Router section using useServerInsertedHTML, and explain why the renderer must be cleared after each streaming flush: renderToStyleElements returns the renderer's entire accumulated CSS on every call, so without clearing, Next duplicates the full stylesheet into on later flushes. Those stale copies override head-inserted styles after a client-side navigation, making makeStyles overrides lose to their makeResetStyles base. Also clarifies the existing heading as 'Next.js (Pages Router)'.