feat(map): redesign Map tab (concept 4c) with a real bordered basemap

[patrickrb]

Implements the 4c Map redesign on the app's existing offline vector map.

What's new

• Real bordered map — country outlines (world_countries.json) now draw in both the equirectangular and azimuthal projections, plus US state borders once zoomed past a threshold (showStateBorders). The border data + loaders already shipped; they were unused until now.
• 4c layout — header (Map + "N decoded · M worked this session" + ⚙ gear) → layer-chip row (Decodes / PSK spots / Worked) → an inset rounded map card. The chips partition which station markers draw.
• Controls — top-left greyline info pill (band + "greyline in Xh Ym"), a 44dp + / − / Me stack where Me recenters on the operator grid, and Projection + Gray line moved into the ⚙ menu to keep the chrome clean.
• Station card restyled to 4c (avatar + callsign + distance · bearing · SNR + Details). Details currently closes the card; wiring it to the full QSO sheet is a follow-up.

Scope

• Map screen only — the existing 6-tab navigation is unchanged.
• "Real map" = the existing offline vector basemap with borders (no tile/slippy-map dependency), per the requirement to show borders without needing connectivity in the field.

Testing

• New pure logic extracted to MapRedesign.kt (layer visibility, greyline countdown, formatting) and MapViewport.panToCenter, covered by MapRedesignTest (all passing).
• assembleDebug builds; verified live on a tablet emulator with demo data (borders render, gear menu, greyline countdown, recenter).

🤖 Generated with Claude Code

Screenshots

Bolder station indicators — bigger dots, a layered glow, and a raised SNR floor so weak decodes still read; the operator is a bold amber "you are here" dot. Shapes (triangle CQ / diamond to-me / donut worked / dot) are kept:

Auto-fit to markers — the map frames the region that actually has stations instead of a mostly-empty world. A regional run zooms into North America (state borders appear); a global spread stays at world view:

Map options menu — Projection + Gray line live in the ⚙ gear:

[codecov]

Codecov Report

❌ Patch coverage is 11.69451% with 370 lines in your changes missing coverage. Please review.
✅ Project coverage is 41.50%. Comparing base (34b3d0e) to head (ab8db56).
⚠️ Report is 7 commits behind head on dev.

Files with missing lines	Patch %	Lines
...main/kotlin/radio/ks3ckc/ft8af/ui/map/MapScreen.kt	1.07%	367 Missing ⚠️
...in/kotlin/radio/ks3ckc/ft8af/ui/map/MapRedesign.kt	93.18%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                dev     #911      +/-   ##
============================================
- Coverage     42.07%   41.50%   -0.57%     
  Complexity      252      252              
============================================
  Files           278      280       +2     
  Lines         33383    33973     +590     
  Branches       3914     4033     +119     
============================================
+ Hits          14045    14100      +55     
- Misses        19051    19584     +533     
- Partials        287      289       +2     

Flag	Coverage Δ
android	17.59% <11.69%> (-0.26%)	⬇️
native	9.93% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...in/kotlin/radio/ks3ckc/ft8af/ui/map/MapViewport.kt	100.00% <100.00%> (+3.84%)	⬆️
...in/kotlin/radio/ks3ckc/ft8af/ui/map/MarkerStyle.kt	100.00% <100.00%> (ø)
...in/kotlin/radio/ks3ckc/ft8af/ui/map/MapRedesign.kt	93.18% <93.18%> (ø)
...main/kotlin/radio/ks3ckc/ft8af/ui/map/MapScreen.kt	7.46% <1.07%> (-1.56%)	⬇️

... and 9 files with indirect coverage changes

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