feat(ts-web): add credentials support and DO NOT EDIT header to generated clients (#122)

Update TypeScript web client generator to include credentials in fetch
configuration for cookie-based authentication and cross-origin requests.
Also add idiomatic DO NOT EDIT comment to generated file headers.

Changes:
- Add fetch wrapper with credentials: 'include' to createGrpcWebTransport
- Add DO NOT EDIT comment following Go convention
- Use cleaner arrow function syntax for fetch override

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-authored-by: Claude <[email protected]>

Author: BRBussy

tool/protoc-gen-mesh_ts_web/src/index.ts

@@ -29,6 +29,7 @@ function generateConnectClientManually(schema: Schema, file: DescFile) {
   let content = "";
 
   // Add file header
+  content += `// Code generated by protoc-gen-meshts. DO NOT EDIT.\n`;
   content += `// @generated by protoc-gen-meshts v1\n`;
   content += `// @generated from file ${file.name}.proto (package ${file.proto.package}, syntax proto3)\n`;
   content += `/* eslint-disable */\n`;
@@ -317,9 +318,11 @@ function generateServiceClientString(
   content += "    }\n";
   content += "\n";
   content += "    // Create the gRPC-Web transport for browser with interceptors\n";
+  content += "    // Custom fetch wrapper to include credentials for cookie-based authentication\n";
   content += "    const transport = createGrpcWebTransport({\n";
   content += "      baseUrl: this._config.apiServerURL,\n";
   content += "      interceptors: this._interceptors,\n";
+  content += '      fetch: (input, init) => fetch(input, { ...init, credentials: "include" }),\n';
   content += "    });\n";
   content += "\n";
   content += "    // Construct the Connect-ES client\n";