Add Export action to Bookmarks menu with directory picker improvements

[Copilot]

Implements Export functionality for bookmarked images, copying them to a user-selected directory without modifying the album or requiring folder addition prompts (unlike Move). Also updates directory picker defaults for better UX across all instances.

Backend

• /copy_images/{album_key} endpoint - Copies images by index to target directory using shutil.copy2, preserving originals. Returns detailed success/error statistics. No album lock check required.

class CopyImagesRequest(BaseModel):
    indices: List[int]
    target_directory: str

Frontend

• Export button - Added to Bookmarks menu after Move. Opens directory picker with "Export" action, shows confirmation with copy results.
• Directory picker defaults - Changed button label from "Add" to "Select Directory", moved button right of Cancel, updated path label to "Selected directory:".

// Export opens picker without album folder prompt
createSimpleDirectoryPicker(
  async (targetDirectory) => {
    await this.performExport(indices, targetDirectory);
  },
  startingPath,
  {
    buttonLabel: "Export",
    title: "Select Export Destination",
    showCreateFolder: true
  }
);

Error Handling

Detects and reports: permission denied, file already exists, file not found, invalid directory.

Tests

Added backend tests for copy_images endpoint covering success case and file collision scenario.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Add an Export item to the Bookmarks menu</issue_title>
<issue_description>This feature request is to add an Export menu item to the Bookmarks menu, located under the Move item. The Export action should prompt the user for a server-side folder to copy the current list of bookmarked images into using the filetree browser. It should copy the images, not move them, and should not ask whether the destination folder should be added to the album the way that Move does.

Please detect error conditions (PermissionDenied, attempts that would clobber existing images, etc) and report them appropriately. On success, show a confirmation dialogue.

Also please change the parameters passed to the directory browser (filetree.js) so that the action button (currently labeled "Add") is changed to "Select Directory". Move this button to the right to be adjacent to Cancel. Also change the message "Current directory to add:" to "Selected directory."</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Add an Export item to the Bookmarks menu #179

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[lstein]

works well