When creating a new folder, allow users to enter a path with forward slashes to create the entire folder hierarchy in one step.

Example:
Entering Photos/Events/2021_09_Wedding/Aperitif in the "Folder name" input would create all four nested folders at once.

Expected behavior:
- Folders that already exist are silently skipped
- Only missing folders in the path are created
- Works like mkdir -p on Linux/macOS

Why this helps:
Currently, organizing files into a deep folder structure requires creating each folder individually, navigating into it, then creating the next one. This is tedious when setting up a new hierarchy or importing files that need proper organization. A simple path syntax would save significant time and clicks.