Add profile export and import functionality

- Implemented API endpoints for exporting and importing voice profiles as ZIP archives.
- Enhanced the frontend with new hooks and components for profile export and import, including file handling and user dialogs.
- Integrated Tauri plugins for file system access and dialog interactions to facilitate seamless user experience.
- Updated ProfileCard and ProfileList components to support new export and import features, improving overall functionality.
- Added necessary error handling and validation for file operations to ensure robustness.

app/src/lib/hooks/useProfiles.ts

@@ -1,6 +1,7 @@
 import { useMutation, useQuery, useQueryClient } from '@tanstack/react-query';
 import { apiClient } from '@/lib/api/client';
 import type { VoiceProfileCreate } from '@/lib/api/types';
+import { isTauri } from '@/lib/tauri';
 
 export function useProfiles() {
   return useQuery({
@@ -96,3 +97,73 @@ export function useDeleteSample() {
     },
   });
 }
+
+export function useExportProfile() {
+  return useMutation({
+    mutationFn: async (profileId: string) => {
+      const blob = await apiClient.exportProfile(profileId);
+      
+      // Get profile name for filename
+      const profile = await apiClient.getProfile(profileId);
+      const safeName = profile.name.replace(/[^a-z0-9]/gi, '-').toLowerCase();
+      const filename = `profile-${safeName}.voicebox.zip`;
+      
+      if (isTauri()) {
+        // Use Tauri's native save dialog
+        try {
+          const { save } = await import('@tauri-apps/plugin-dialog');
+          const filePath = await save({
+            defaultPath: filename,
+            filters: [
+              {
+                name: 'Voicebox Profile',
+                extensions: ['voicebox.zip', 'zip'],
+              },
+            ],
+          });
+          
+          if (filePath) {
+            // Write file using Tauri's filesystem API
+            const { writeBinaryFile } = await import('@tauri-apps/plugin-fs');
+            const arrayBuffer = await blob.arrayBuffer();
+            await writeBinaryFile(filePath, new Uint8Array(arrayBuffer));
+          }
+        } catch (error) {
+          console.error('Failed to use Tauri dialog, falling back to browser download:', error);
+          // Fall back to browser download if Tauri dialog fails
+          const url = window.URL.createObjectURL(blob);
+          const a = document.createElement('a');
+          a.href = url;
+          a.download = filename;
+          document.body.appendChild(a);
+          a.click();
+          window.URL.revokeObjectURL(url);
+          document.body.removeChild(a);
+        }
+      } else {
+        // Browser: trigger download
+        const url = window.URL.createObjectURL(blob);
+        const a = document.createElement('a');
+        a.href = url;
+        a.download = filename;
+        document.body.appendChild(a);
+        a.click();
+        window.URL.revokeObjectURL(url);
+        document.body.removeChild(a);
+      }
+      
+      return blob;
+    },
+  });
+}
+
+export function useImportProfile() {
+  const queryClient = useQueryClient();
+
+  return useMutation({
+    mutationFn: (file: File) => apiClient.importProfile(file),
+    onSuccess: () => {
+      queryClient.invalidateQueries({ queryKey: ['profiles'] });
+    },
+  });
+}