fix: persist docs config to localStorage

- Save docsPath, externalDocs, and selectedPath to localStorage
- Restore state when component mounts
- Fix data loss when switching pages

src/components/ApiDocViewer.tsx

@@ -18,13 +18,32 @@ interface ApiDocViewerProps {
   onCloseAddModal?: () => void;
 }
 
+const STORAGE_KEY = 'xc-docs-config';
+
+function loadStoredConfig() {
+  try {
+    const stored = localStorage.getItem(STORAGE_KEY);
+    if (stored) {
+      return JSON.parse(stored);
+    }
+  } catch {}
+  return { docsPath: '', externalDocs: [] as ExternalDoc[], selectedPath: undefined };
+}
+
+function saveStoredConfig(docsPath: string, externalDocs: ExternalDoc[], selectedPath?: string) {
+  try {
+    localStorage.setItem(STORAGE_KEY, JSON.stringify({ docsPath, externalDocs, selectedPath }));
+  } catch {}
+}
+
 export const ApiDocViewer = ({ onDocsPathChange, showAddModal, onCloseAddModal }: ApiDocViewerProps) => {
+  const stored = loadStoredConfig();
   const [fileTree, setFileTree] = useState<DocFile[]>([])
-  const [selectedPath, setSelectedPath] = useState<string | undefined>()
+  const [selectedPath, setSelectedPath] = useState<string | undefined>(stored.selectedPath)
   const [currentContent, setCurrentContent] = useState<string>('')
   const [showModal, setShowModal] = useState(false)
-  const [docsPath, setDocsPath] = useState('')
+  const [docsPath, setDocsPath] = useState(stored.docsPath)
-  const [externalDocs, setExternalDocs] = useState<ExternalDoc[]>([])
+  const [externalDocs, setExternalDocs] = useState<ExternalDoc[]>(stored.externalDocs)
   const [isLoading, setIsLoading] = useState(false)
   const [errorMsg, setErrorMsg] = useState<string | null>(null)
 
@@ -35,6 +54,35 @@ export const ApiDocViewer = ({ onDocsPathChange, showAddModal, onCloseAddModal }
     }
   }, [showAddModal])
 
+  useEffect(() => {
+    if (externalDocs.length > 0 && fileTree.length > 0 && !selectedPath) {
+      const fileList = externalDocs
+        .filter(doc => {
+          const parts = doc.relativePath.split('/')
+          if (parts.length < 2) return true
+          const filename = parts[parts.length - 1].replace(/\.md$/, '')
+          const parentFolder = parts[parts.length - 2]
+          return filename !== parentFolder
+        })
+        .map(d => d.relativePath)
+      
+      const targetPath = stored.selectedPath && externalDocs.find(d => d.relativePath === stored.selectedPath)
+        ? stored.selectedPath
+        : fileList[0]
+      
+      if (targetPath) {
+        setSelectedPath(targetPath)
+        setCurrentContent(externalDocs.find(d => d.relativePath === targetPath)?.content || '')
+      }
+    }
+  }, [externalDocs, fileTree, selectedPath])
+
+  useEffect(() => {
+    if (docsPath && externalDocs.length > 0) {
+      saveStoredConfig(docsPath, externalDocs, selectedPath)
+    }
+  }, [docsPath, externalDocs, selectedPath])
+
   const loadDocsFromPath = async (basePath: string): Promise<boolean> => {
     if (!basePath) {
       setErrorMsg('请输入文档路径')
@@ -70,6 +118,7 @@ export const ApiDocViewer = ({ onDocsPathChange, showAddModal, onCloseAddModal }
       }
       
       setExternalDocs(docs)
+      saveStoredConfig(basePath, docs)
       
       const fileList = docs
         .filter(doc => {
@@ -86,6 +135,9 @@ export const ApiDocViewer = ({ onDocsPathChange, showAddModal, onCloseAddModal }
       if (fileList.length > 0) {
         setSelectedPath(fileList[0])
         setCurrentContent(docs[0].content)
+        saveStoredConfig(basePath, docs, fileList[0])
+      } else {
+        saveStoredConfig(basePath, docs, undefined)
       }
       return true
     } catch (err) {