fix(frontend): keep regen in-flight lock on client disconnect (tab switch)

Made-with: Cursor

frontend/src/composables/useGenerationInFlight.js

@@ -58,6 +58,20 @@ export function generationInFlightKey() {
   return inFlightKey
 }
 
+/**
+ * 切换页签/隐藏标签时浏览器可能中止 fetch，表现为 TypeError 等；此时服务端可能仍在执行，
+ * 不应清除「进行中」标记（否则按钮误恢复可点）。HTTP 4xx/5xx 仍由业务层 return，走正常清除。
+ */
+function isAmbiguousClientFailure(err) {
+  if (err == null) return false
+  const name = err.name || ''
+  if (name === 'AbortError') return true
+  const msg = String(err.message || err)
+  return /Failed to fetch|NetworkError|Load failed|ERR_NETWORK|INTERNET_DISCONNECTED|aborted|cancel/i.test(
+    msg,
+  )
+}
+
 /**
  * @param {string} key
  * @param {() => Promise<T>} fn
@@ -67,11 +81,17 @@ export async function withGenerationInFlight(key, fn) {
   inFlightKey.value = key
   writePersisted(key)
   try {
-    return await fn()
-  } finally {
+    const out = await fn()
     if (inFlightKey.value === key) {
       inFlightKey.value = null
       writePersisted(null)
     }
+    return out
+  } catch (e) {
+    if (inFlightKey.value === key && !isAmbiguousClientFailure(e)) {
+      inFlightKey.value = null
+      writePersisted(null)
+    }
+    throw e
   }
 }

frontend/src/views/jd/JdAnalysisBuildView.vue

@@ -156,8 +156,8 @@ async function regenerateReport() {
   if (!id) return
   regenErr.value = ''
   const key = `${REGEN_PREFIX}${id}`
-  await withGenerationInFlight(key, async () => {
-    try {
+  try {
+    await withGenerationInFlight(key, async () => {
       const r = await api(`/api/jobs/${id}/regenerate-report/`, {
         method: 'POST',
         body: JSON.stringify({
@@ -177,10 +177,10 @@ async function regenerateReport() {
       const updated = JSON.parse(text)
       const idx = jobs.value.findIndex((x) => x.id === updated.id)
       if (idx >= 0) jobs.value[idx] = updated
-    } catch (e) {
-      regenErr.value = String(e)
-    }
-  })
+    })
+  } catch (e) {
+    regenErr.value = String(e)
+  }
 }
 
 onMounted(loadList)