Migrate useFileNavigation hook

app/src/hooks/useFileNavigation.ts

@@ -0,0 +1,51 @@
+import { useState, useCallback, useEffect } from 'react';
+import { DEFAULT_FILE } from '../types/file';
+import { useWorkspace } from '../contexts/WorkspaceContext';
+import { useLastOpenedFile } from './useLastOpenedFile';
+
+interface UseFileNavigationResult {
+  selectedFile: string;
+  isNewFile: boolean;
+  handleFileSelect: (filePath: string | null) => Promise<void>;
+}
+
+export const useFileNavigation = (): UseFileNavigationResult => {
+  const [selectedFile, setSelectedFile] = useState<string>(DEFAULT_FILE.path);
+  const [isNewFile, setIsNewFile] = useState<boolean>(true);
+  const { currentWorkspace } = useWorkspace();
+  const { loadLastOpenedFile, saveLastOpenedFile } = useLastOpenedFile();
+
+  const handleFileSelect = useCallback(
+    async (filePath: string | null): Promise<void> => {
+      const newPath = filePath || DEFAULT_FILE.path;
+      setSelectedFile(newPath);
+      setIsNewFile(!filePath);
+
+      if (filePath) {
+        await saveLastOpenedFile(filePath);
+      }
+    },
+    [saveLastOpenedFile]
+  );
+
+  // Load last opened file when workspace changes
+  useEffect(() => {
+    const initializeFile = async (): Promise<void> => {
+      setSelectedFile(DEFAULT_FILE.path);
+      setIsNewFile(true);
+
+      const lastFile = await loadLastOpenedFile();
+      if (lastFile) {
+        handleFileSelect(lastFile);
+      } else {
+        handleFileSelect(null);
+      }
+    };
+
+    if (currentWorkspace) {
+      initializeFile();
+    }
+  }, [currentWorkspace, loadLastOpenedFile, handleFileSelect]);
+
+  return { selectedFile, isNewFile, handleFileSelect };
+};