build: update npm install command to use --legacy-peer-deps

This change modifies the build scripts to use --legacy-peer-deps flag when installing npm dependencies to resolve potential peer dependency conflicts during the build process. The change is applied to both bash (build.sh) and batch (build.bat) build scripts.

frontend/node_modules/eslint/lib/rules/no-eq-null.js

@@ -10,42 +10,37 @@
 // Rule Definition
 //------------------------------------------------------------------------------
 
-/** @type {import('../types').Rule.RuleModule} */
+/** @type {import('../shared/types').Rule} */
 module.exports = {
-	meta: {
-		type: "suggestion",
+    meta: {
+        type: "suggestion",
 
-		docs: {
-			description:
-				"Disallow `null` comparisons without type-checking operators",
-			recommended: false,
-			url: "https://eslint.org/docs/latest/rules/no-eq-null",
-		},
+        docs: {
+            description: "Disallow `null` comparisons without type-checking operators",
+            recommended: false,
+            url: "https://eslint.org/docs/latest/rules/no-eq-null"
+        },
 
-		schema: [],
+        schema: [],
 
-		messages: {
-			unexpected: "Use '===' to compare with null.",
-		},
-	},
+        messages: {
+            unexpected: "Use '===' to compare with null."
+        }
+    },
 
-	create(context) {
-		return {
-			BinaryExpression(node) {
-				const badOperator =
-					node.operator === "==" || node.operator === "!=";
+    create(context) {
 
-				if (
-					(node.right.type === "Literal" &&
-						node.right.raw === "null" &&
-						badOperator) ||
-					(node.left.type === "Literal" &&
-						node.left.raw === "null" &&
-						badOperator)
-				) {
-					context.report({ node, messageId: "unexpected" });
-				}
-			},
-		};
-	},
+        return {
+
+            BinaryExpression(node) {
+                const badOperator = node.operator === "==" || node.operator === "!=";
+
+                if (node.right.type === "Literal" && node.right.raw === "null" && badOperator ||
+                        node.left.type === "Literal" && node.left.raw === "null" && badOperator) {
+                    context.report({ node, messageId: "unexpected" });
+                }
+            }
+        };
+
+    }
 };