fix: remove .next build artifacts from git tracking

- Add .next to .gitignore to prevent future conflicts
- Remove all build artifacts from git tracking
- Focus on source code changes only for cleaner merges

.next/server/middleware-build-manifest.js

@@ -1,32 +0,0 @@
-self.__BUILD_MANIFEST = {
-  "polyfillFiles": [
-    "static/chunks/polyfills.js"
-  ],
-  "devFiles": [
-    "static/chunks/react-refresh.js"
-  ],
-  "ampDevFiles": [],
-  "lowPriorityFiles": [],
-  "rootMainFiles": [
-    "static/chunks/webpack.js",
-    "static/chunks/main-app.js"
-  ],
-  "pages": {
-    "/_app": [
-      "static/chunks/webpack.js",
-      "static/chunks/main.js",
-      "static/chunks/pages/_app.js"
-    ],
-    "/_error": [
-      "static/chunks/webpack.js",
-      "static/chunks/main.js",
-      "static/chunks/pages/_error.js"
-    ]
-  },
-  "ampFirstPages": []
-};
-self.__BUILD_MANIFEST.lowPriorityFiles = [
-"/static/" + process.env.__NEXT_BUILD_ID + "/_buildManifest.js",
-,"/static/" + process.env.__NEXT_BUILD_ID + "/_ssgManifest.js",
-
-];