feat: implement permission handling in ModelsScreen and update PermissionMessage component

app/src/screens/LocalModelsScreen/index.tsx

@@ -28,7 +28,6 @@ import type { ModelConfig } from '../../store/types';
 import ModelItem from './ModelItem';
 import DirectoryPicker from './DirectoryPicker';
 import DirectoryEditor from './DirectoryEditor';
-import PermissionMessage from './PermissionMessage';
 import ModelsList from './ModelsList';
 import { createStyles } from './styles';
 import { useTheme } from '../../theme/ThemeProvider';
@@ -381,9 +380,6 @@ export default function LocalModelsScreen() {
             )}
           </View>
         )}
-        {!hasPermission && (
-          <PermissionMessage onRequestPermission={handleRequestPermission} />
-        )}
       </View>
 
       {/* Models List */}