feat(linter): enforce correctness on unused imports

Configures the linter to treat unused imports as an error under the
`correctness` rule category. This tightens up code quality standards by
ensuring all imported bindings are utilized.
If the import is unused, there is a high chance refactoring missed this
flow. Review in-depth root causes.

biome.json

@@ -15,7 +15,10 @@
   "linter": {
     "enabled": true,
     "rules": {
-      "recommended": true
+      "recommended": true,
+      "correctness": {
+        "noUnusedImports": "error"
+      }
     }
   },
   "javascript": {