Clarify sub-location creation and auto-select new sub-locations

[barronlroth]

Summary

Make sub-location creation clearer and automatically select/expand newly created sub-locations.

Problem

During item entry, the current “Add Storage Location” flow was confusing when launched from an existing location. It was not obvious that the user was creating a new sub-location, and the name field was interpreted more like “location details”/description rather than the actual location title.

There was also a follow-up usability issue: after creating a new sub-location, the picker should make it obvious where that sub-location went and select it for the item.

Expected behavior

When creating a location under an existing location:

• The modal title/copy should say “Add Sub-location” or otherwise clearly explain that this creates a child location.
• The text field should make clear that the user is entering the location name/title, not details/description.
• After creation, the parent location should expand by default so the new child is visible.
• The newly created sub-location should be auto-selected for the item/location picker context.

Acceptance criteria

• Add-location modal title is context-aware: root location vs sub-location.
• Field label/placeholder clarifies “Location name” / “Sub-location name.”
• Newly created sub-locations are visible immediately after creation.
• In item-add/location-picker flow, newly created sub-location is selected automatically.
• Add/update tests or QA script for creating a sub-location from the picker and confirming selection state.

Notes

Reported during Nina feedback session while adding an item into a linen closet/top shelf flow.