Integrate backend APIs and move review to center editor tab

src/core/TextFilePolicy.js

@@ -1,6 +1,6 @@
 export class TextFilePolicy {
   constructor() {
-    this.maxSizeBytes = 5 * 1024 * 1024;
+    this.maxSizeBytes = 1 * 1024 * 1024;
     this.allowedExtensions = new Set([
       ".txt", ".md", ".json", ".xml", ".yaml", ".yml", ".js", ".jsx", ".ts", ".tsx",
       ".css", ".html", ".py", ".java", ".go", ".rs", ".sql", ".sh", ".env", ".ini", ".toml"