Terrain elevations now include the earth bulge correction, so the
profile visually humps up in the middle relative to the straight
LOS beam — showing how the curved earth rises into the signal path.
Uses actual k-factor from HRRR refractivity when available, otherwise
standard 4/3. For a 300 km path at k=4/3, the midpoint bulge is
~2,650 m (8,700 ft).
- Mark duct closest to endpoint elevations as likely signal path
- Likely duct drawn with solid borders, bold label, stronger fill
- Other ducts shown dimmed with dashed borders
- Fix path info layout: table columns prevent El wrapping
- Surface observations as compact table, limited to 5 nearest stations
- Use all HRRR profiles along path (start, mid, end) for duct detection
- Fall back to sounding ducts when HRRR too coarse to detect layers
- Merge overlapping ducts, show top 3 strongest with source labels
- Limit surface observations to 5 closest stations along path
- Compact solar conditions as inline row
- Compact band/mode/distance info line
- Fix button text to "Flag as Invalid"
- Overlay HRRR duct layers on elevation profile chart (green bands)
- Add flagged_invalid field to contacts with toggle button on detail page
- Fix prune_old_grid_profiles to only delete 0.125° grid profiles,
preserving QSO-linked HRRR data at arbitrary positions
- Auto-enqueue HRRR fetch when viewing contact without HRRR data (<48h)
- Compact solar conditions and contact details layout
- Add band/mode/distance info line to elevation profile section
- Leaflet map on contact detail pages showing both station locations
- SRTM elevation profile with Chart.js: terrain, LOS, Fresnel zone
- Path info: distance, azimuth, elevation angle in both directions
- Compact 4-column grid layout for contact details
- Contact map page with all contacts plotted
- Rename QSOs to Contacts in page header
- Wrap algo page in standard layout
