### What?
Fixes the export field selection dropdown to correctly differentiate
between fields in named and unnamed tabs.
### Why?
Previously, when a `tabs` field contained both named and unnamed tabs,
subfields with the same `name` would appear as duplicates in the
dropdown (e.g. `Tab To CSV`, `Tab To CSV`). Additionally, selecting a
field from a named tab would incorrectly map it to the unnamed version
due to shared labels and missing path prefixes.
### How?
- Updated the `reduceFields` utility to manually construct the field
path and label using the tab’s `name` if present.
- Ensured unnamed tabs treat subfields as top-level and skip prefixing
altogether.
- Adjusted label prefix logic to show `Named Tab > Field Name` when
appropriate.
#### Before
<img width="169" height="79" alt="Screenshot 2025-07-15 at 2 55 14 PM"
src="https://github.com/user-attachments/assets/2ab2d19e-41a3-4be2-8496-1da2a79f88e1"
/>
#### After
<img width="211" height="79" alt="Screenshot 2025-07-15 at 2 50 38 PM"
src="https://github.com/user-attachments/assets/0620e96a-71cd-4eb1-9396-30d461ed47a5"
/>
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