Add pre-commit hook for linting and formatting

.husky/pre-commit

@@ -0,0 +1,34 @@
+CHANGED_FILES=$(git diff --cached --name-only)
+
+LINT_FRONTEND=false
+LINT_BACKEND=false
+
+for FILE in $CHANGED_FILES; do
+  if [[ $FILE =~ ^frontend/ ]]; then
+    LINT_FRONTEND=true
+  elif [[ $FILE =~ ^backend/ ]]; then
+    LINT_BACKEND=true
+  fi
+done
+
+if [ "$LINT_FRONTEND" = true ]; then
+  echo "Changes detected in the frontend. Linting & Formatting frontend..."
+  cd frontend && npm run lint && npm run format:check
+  EXIT_CODE=$?
+  cd ..
+  if [ $EXIT_CODE -ne 0 ]; then
+    echo "Frontend linting failed. Commit aborted."
+    exit 1
+  fi
+fi
+
+if [ "$LINT_BACKEND" = true ]; then
+  echo "Changes detected in the backend. Linting & Formatting backend..."
+  cd backend && npm run lint && npm run format
+  EXIT_CODE=$?
+  cd ..
+  if [ $EXIT_CODE -ne 0 ]; then
+    echo "Backend linting failed. Commit aborted."
+    exit 1
+  fi
+fi