fix: update error handling in JSON parsing and add ESLint rule for unused variables

client/eslint.config.js

@@ -23,6 +23,10 @@ export default tseslint.config(
         "warn",
         { allowConstantExport: true },
       ],
+      "@typescript-eslint/no-unused-vars": [
+        "error",
+        { argsIgnorePattern: "^_" },
+      ],
     },
   },
 );

client/src/components/CustomHeaders.tsx

@@ -90,7 +90,7 @@ const CustomHeaders = ({
       onChange(newHeaders);
       setJsonError(null);
       setIsJsonMode(false);
-    } catch (error) {
+    } catch {
       setJsonError("Invalid JSON format");
     }
   };