[feat] Update history API to v2 array format and add comprehensive tests

- Migrate from object-based to array-based history response format
- Update /history endpoint to /history_v2 with max_items parameter
- Add lazy loading of workflows via /history_v2/:prompt_id endpoint
- Implement comprehensive browser tests for history API functionality
- Add unit tests for API methods and queue store
- Update TaskItemImpl to support history workflow loading
- Add proper error handling and edge case coverage
- Follow established test patterns for better maintainability

This change improves performance by reducing initial payload size
and enables on-demand workflow loading for history items.

browser_tests/fixtures/utils/taskHistory.ts

@@ -34,17 +34,23 @@ const getContentType = (filename: string, fileType: OutputFileType) => {
 }
 
 const setQueueIndex = (task: TaskItem) => {
-  task.prompt[0] = TaskHistory.queueIndex++
+  task.prompt.priority = TaskHistory.queueIndex++
 }
 
 const setPromptId = (task: TaskItem) => {
-  task.prompt[1] = uuidv4()
+  if (!task.prompt.prompt_id || task.prompt.prompt_id === 'prompt-id') {
+    task.prompt.prompt_id = uuidv4()
+  }
 }
 
 export default class TaskHistory {
   static queueIndex = 0
   static readonly defaultTask: Readonly<HistoryTaskItem> = {
-    prompt: [0, 'prompt-id', {}, { client_id: uuidv4() }, []],
+    prompt: {
+      priority: 0,
+      prompt_id: 'prompt-id',
+      extra_data: { client_id: uuidv4() }
+    },
     outputs: {},
     status: {
       status_str: 'success',
@@ -66,10 +72,37 @@ export default class TaskHistory {
   )
 
   private async handleGetHistory(route: Route) {
+    const url = route.request().url()
+
+    // Handle history_v2/:prompt_id endpoint
+    const promptIdMatch = url.match(/history_v2\/([^?]+)/)
+    if (promptIdMatch) {
+      const promptId = promptIdMatch[1]
+      const task = this.tasks.find((t) => t.prompt.prompt_id === promptId)
+      const response: Record<string, any> = {}
+      if (task) {
+        response[promptId] = task
+      }
+      return route.fulfill({
+        status: 200,
+        contentType: 'application/json',
+        body: JSON.stringify(response)
+      })
+    }
+
+    // Handle history_v2 list endpoint
+    // Convert HistoryTaskItem to RawHistoryItem format expected by API
+    const rawHistoryItems = this.tasks.map((task) => ({
+      prompt_id: task.prompt.prompt_id,
+      prompt: task.prompt,
+      status: task.status,
+      outputs: task.outputs,
+      ...(task.meta && { meta: task.meta })
+    }))
     return route.fulfill({
       status: 200,
       contentType: 'application/json',
-      body: JSON.stringify(this.tasks)
+      body: JSON.stringify({ history: rawHistoryItems })
     })
   }
 
@@ -93,7 +126,7 @@ export default class TaskHistory {
 
   async setupRoutes() {
     return this.comfyPage.page.route(
-      /.*\/api\/(view|history)(\?.*)?$/,
+      /.*\/api\/(view|history_v2)(\/[^?]*)?(\?.*)?$/,
       async (route) => {
         const request = route.request()
         const method = request.method()