chore: migrate to OpenNext adapter for Cloudflare Pages (Next.js 16 support)

.gitignore

@@ -39,3 +39,7 @@ yarn-error.log*
 # typescript
 *.tsbuildinfo
 next-env.d.ts
+
+# Cloudflare / OpenNext
+.open-next
+.wrangler

open-next.config.ts

@@ -0,0 +1,9 @@
+import { defineCloudflareConfig } from "@opennextjs/cloudflare";
+
+export default defineCloudflareConfig({
+	// Uncomment to enable R2 cache,
+	// It should be imported as:
+	// `import r2IncrementalCache from "@opennextjs/cloudflare/overrides/incremental-cache/r2-incremental-cache";`
+	// See https://opennext.js.org/cloudflare/caching for more details
+	// incrementalCache: r2IncrementalCache,
+});

package.json

@@ -6,7 +6,9 @@
     "dev": "next dev",
     "build": "next build",
     "start": "next start",
-    "lint": "eslint"
+    "lint": "eslint",
+    "deploy": "opennextjs-cloudflare build && opennextjs-cloudflare deploy",
+    "preview": "opennextjs-cloudflare build && opennextjs-cloudflare preview"
   },
   "dependencies": {
     "@radix-ui/react-accordion": "^1.2.12",
@@ -24,7 +26,7 @@
     "tailwind-merge": "^3.4.0"
   },
   "devDependencies": {
-    "@cloudflare/next-on-pages": "^1.13.16",
+    "@opennextjs/cloudflare": "^1.15.1",
     "@tailwindcss/postcss": "^4",
     "@types/node": "^20",
     "@types/react": "^19",
@@ -33,6 +35,7 @@
     "eslint-config-next": "16.1.4",
     "tailwindcss": "^4",
     "tw-animate-css": "^1.4.0",
-    "typescript": "^5"
+    "typescript": "^5",
+    "wrangler": "^4.60.0"
   }
 }

wrangler.jsonc

@@ -0,0 +1,34 @@
+/**
+ * For more details on how to configure Wrangler, refer to:
+ * https://developers.cloudflare.com/workers/wrangler/configuration/
+ */
+{
+	"$schema": "node_modules/wrangler/config-schema.json",
+	"name": "nihonbuzz",
+	"main": ".open-next/worker.js",
+	"compatibility_date": "2025-12-01",
+	"compatibility_flags": [
+		"nodejs_compat",
+		"global_fetch_strictly_public"
+	],
+	"assets": {
+		"binding": "ASSETS",
+		"directory": ".open-next/assets"
+	},
+	"images": {
+		// Enable image optimization
+		// see https://opennext.js.org/cloudflare/howtos/image
+		"binding": "IMAGES"
+	},
+	"services": [
+		{
+			// Self-reference service binding, the service name must match the worker name
+			// see https://opennext.js.org/cloudflare/caching
+			"binding": "WORKER_SELF_REFERENCE",
+			"service": "nihonbuzz"
+		}
+	],
+	"observability": {
+		"enabled": true
+	}
+}