feat(nextjs) Update quickstart and manual setup

docs/platforms/javascript/common/troubleshooting/index.mdx

@@ -38,6 +38,59 @@ If you set up the Sentry SDK and it's not sending any data to Sentry:
 
 </Expandable>
 
+<PlatformSection supported={["javascript.nextjs"]}>
+
+<Expandable permalink title="Next.js Setup Verification Checklist">
+
+Use this checklist to systematically verify your Next.js Sentry setup:
+
+<VerificationChecklist checklistId="nextjs-troubleshooting">
+  <ChecklistItem
+    id="config-files-exist"
+    label="Configuration files exist"
+    description="Verify that instrumentation-client.ts, sentry.server.config.ts, and sentry.edge.config.ts exist in your project root."
+  />
+  <ChecklistItem
+    id="dsn-configured"
+    label="DSN is configured correctly"
+    description="Check that each config file has a valid DSN. The DSN should start with https:// and contain your project ID."
+  />
+  <ChecklistItem
+    id="next-config-wrapped"
+    label="next.config.ts uses withSentryConfig"
+    description="Your Next.js config should be wrapped with withSentryConfig from @sentry/nextjs."
+  />
+  <ChecklistItem
+    id="global-error-exists"
+    label="global-error.tsx exists (App Router)"
+    description="For App Router, check that app/global-error.tsx exists to capture React rendering errors."
+  />
+  <ChecklistItem
+    id="no-adblocker"
+    label="Ad-blocker is disabled"
+    description="Ad-blockers can block requests to Sentry. Disable them or configure tunnelRoute in your next.config.ts."
+  />
+  <ChecklistItem
+    id="check-console"
+    label="No errors in browser console"
+    description="Open browser DevTools and check for any Sentry-related errors. Add debug: true to Sentry.init() for more details."
+  />
+  <ChecklistItem
+    id="check-network"
+    label="Network requests are being sent"
+    description="In DevTools Network tab, filter for 'sentry' or 'envelope'. You should see requests when errors occur."
+  />
+  <ChecklistItem
+    id="check-quota"
+    label="Sentry quota is not exceeded"
+    description="Check your Sentry Stats and Subscription pages to ensure you haven't exceeded your quota."
+  />
+</VerificationChecklist>
+
+</Expandable>
+
+</PlatformSection>
+
 <Expandable permalink title="Updating to a new Sentry SDK version">
 
 If you update your Sentry SDK to a new major version, you might encounter breaking changes that need some adaption on your end.

docs/platforms/javascript/guides/nextjs/configuration/build/index.mdx

@@ -16,7 +16,7 @@ keywords:
   ]
 ---
 
-The Sentry Next.js SDK supports automatic code injection and source map upload during your app's build process using the `withSentryConfig` wrapper in your Next.js configuration file (`next.config.js` or `next.config.mjs`). For information on updating the configuration, see [Extend Next.js Configuration](../../manual-setup/#extend-your-nextjs-configuration).
+The Sentry Next.js SDK supports automatic code injection and source map upload during your app's build process using the `withSentryConfig` wrapper in your Next.js configuration file (`next.config.js` or `next.config.mjs`). For information on updating the configuration, see the [Manual Setup guide](/platforms/javascript/guides/nextjs/manual-setup/#configure).
 
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