lint: add eslint plugin for organizing and validating whole import statements

Author: steadyfall

.eslintrc.json

@@ -1,14 +1,31 @@
 {
   "extends": [
     "next/core-web-vitals",
-    "next/typescript"
+    "next/typescript",
+    "plugin:prettier/recommended",
+    "plugin:import/errors",
+    "plugin:import/warnings",
+    "plugin:import/typescript"
   ],
+  "plugins": ["prettier", "import"],
   "rules": {
     // Code quality
     "no-console": "warn",
     "no-debugger": "error",
     // "no-unused-vars": "off", // Handled by TS version above
 
+    // Import sorting and cleanliness
+    "import/order": [
+      "error",
+      {
+        "groups": ["builtin", "external", "internal", "parent", "sibling", "index", "object", "type"],
+        "newlines-between": "always",
+        "alphabetize": { "order": "asc", "caseInsensitive": true }
+      }
+    ],
+    "import/newline-after-import": "error",
+    "import/no-duplicates": "error",
+
     // Prettier takes over formatting rules now
     "prettier/prettier": "error"
   }

package-lock.json

@@ -37,6 +37,7 @@
     "eslint": "9.14.0",
     "eslint-config-next": "15.0.3",
     "eslint-config-prettier": "^10.1.1",
+    "eslint-plugin-import": "^2.31.0",
     "eslint-plugin-prettier": "^5.2.6",
     "postcss": "^8",
     "prettier": "^3.5.3",