lint and CI

- add CI for direct push on main
- add no unused vars error

Author: Sreejit-Sengupto

.github/workflows/format_lint.yaml

@@ -1,5 +1,8 @@
 name: "Format and Lint CI"
 on:
+  push:
+    branches:
+      - main
   pull_request:
     branches:
       - main

eslint.config.mjs

@@ -12,6 +12,9 @@ const compat = new FlatCompat({
 const eslintConfig = [
     {
         ignores: ["src/components/ui"],
+        rules: {
+            "no-unused-vars": "error"
+        }
     },
     ...compat.extends("next/core-web-vitals", "next/typescript"),
 ];