Confidence mode location dropdown shows raw PSMSL IDs instead of coordinates

[Ttheegela]

Describe the bug
When running in confidence mode with no location.lst file present, the location dropdown shows raw PSMSL station IDs (ID 1, ID 2, etc.) instead of any meaningful location information.

Root cause
load_confidence_files() fell back to f"ID {loc_id}" when no location.lst was available. The lat/lon coordinates were already embedded in the .nc file metadata but were not being read.

Fix
Fallback now reads lat/lon from .nc file metadata and displays geographic coordinates (e.g. 48.38°N, -4.49°E) instead of the raw PSMSL ID.

Fixed in
Commit d3a08d1

[Ttheegela]

Fixed in commit d3a08d1 confidence mode location labels now display formatted coordinates (e.g. 48.38°N, -4.49°E) instead of raw PSMSL station IDs.