Preset selection when creating a new export collection

[Weisl]

When creating a new export collection, users should be able to select a preset directly in the creation dialog/operator, so the collection is configured correctly from the start.

Current state: The create_export_collections operator already has an addon_preset_selection property, but it may not be consistently surfaced in the UI or applied properly in all creation flows (e.g. single collection creation vs. batch from selected objects).

Requested behavior:

• The preset dropdown should be visible and functional in the creation popup/invoke dialog
• The selected preset should be applied to the new collection immediately on creation
• Should work for both single and batch collection creation
• Default to the last-used preset (or scene-level selected preset if set)