Show durable reservation acquisition progress in download tasks

tests/javascript/helpers/arr_ui_harness.cjs

@@ -11,8 +11,17 @@ assert(source.endsWith(boot+'\n') || source.endsWith(boot));
 function harness(respond) {
   const elements=new Map(), storage=new Map(), storageReads=[], calls=[];
   const element=selector => {
-    if (!elements.has(selector)) elements.set(selector,{value:'', disabled:false, hidden:false, textContent:'', innerHTML:'',style:{},
-      classList:{add(){},remove(){},toggle(){},contains(){return false;}},setAttribute(){},removeAttribute(){},querySelectorAll(){return [];},scrollIntoView(){},focus(){}});
+    if (!elements.has(selector)) {
+      const attributes=new Map(),classes=new Set();
+      elements.set(selector,{value:'', disabled:false, hidden:false, textContent:'', innerHTML:'',style:{},
+        classList:{add:value=>classes.add(value),remove:value=>classes.delete(value),toggle(value,force){
+          const enabled=force===undefined?!classes.has(value):force;
+          if(enabled) classes.add(value); else classes.delete(value);
+          return enabled;
+        },contains:value=>classes.has(value)},setAttribute:(key,value)=>attributes.set(key,String(value)),
+        removeAttribute:key=>attributes.delete(key),getAttribute:key=>attributes.get(key)??null,
+        querySelectorAll(){return [];},scrollIntoView(){},focus(){}});
+    }
     return elements.get(selector);
   };
   const context=vm.createContext({Headers, console, Date, Intl, Uint8Array,
@@ -32,7 +41,7 @@ function harness(respond) {
     const node={dataset:{arrDataReviewItemId:itemId},querySelector:()=>input};
     return {input,button:{closest:()=>node}};
   };
-  return {...subject,calls,storage,storageReads,element,row,submit:()=>subject.submitARRDownload({preventDefault(){}})};
+  return {...subject,calls,storage,storageReads,element,row,i18n:context.window.ARRI18n,submit:()=>subject.submitARRDownload({preventDefault(){}})};
 }
 const response=(status,data,code) => ({status,ok:status<400,json:async()=>code?{ok:false,error:{code}}:{ok:true,data}});
 const scopedKey=(context='production',username='operator')=>`arr:last-download:v2:${encodeURIComponent(context)}:${encodeURIComponent(username)}`;