build: pagecheck as standalone node script (inline escaping was fragile)

Makefile

@@ -7,15 +7,22 @@ else
     TARGET := commandcode.so
 endif
 
-.PHONY: all build test clean lint
+.PHONY: all build test clean lint pagecheck
 
-all: build
+all: build pagecheck
 
 build:
 	CGO_ENABLED=1 go build -buildmode=c-shared -o $(TARGET) main.go
 
+# Extract embedded JS from quota_page.go and syntax-check it with node.
+# Guards against parse-time SyntaxErrors (e.g. duplicate const) that break
+# the whole resource page; Go substring tests cannot catch these.
+pagecheck:
+	@node scripts/pagecheck.js
+
 test:
 	go test -v -race ./...
+	$(MAKE) pagecheck
 
 clean:
 	rm -f commandcode.dylib commandcode.so commandcode.dll commandcode.h