Car status dashboard: POTA-to-validate, ROTA miles, and session-fallback rows (pane)

[patrickrb]

What

Implements the CarPlay/Android Auto status-dashboard design (Claude Design project) on top of the merged dev. This is the pane-path rework of #730: #729 removed the Play-rejected map/surface variant that #730 was originally built on, so this ports only the host-agnostic dashboard rows onto the read-only PaneTemplate.

Beside the existing headline / sequence / band rows, the activation block now shows:

• POTA row — POTA K-1234 · N QSOs with a N more to validate the activation → Activation validated secondary (POTA's 10-QSO program rule; POTA_ACTIVATION_TARGET = 10).
• ROTA row — ROTA <trip> · N QSOs with a X.X mi driven this activation secondary. car_rota_line is split from Restore Android Auto (Play-approved IOT shape) + POTA/ROTA status rows #729's 3-arg inline form to a 2-arg title + new car_rota_miles secondary.
• Session-fallback row — Session · N QSOs / Last logged JA1XYZ · 20m · 41 min, shown only when neither POTA nor ROTA is active (the design's "activation rows drop out, session stats take the slot").
• Band decodes secondary — N decodes last cycle.

How

Decision/format logic lives in pure, Android-free helpers in CarQsoStatus.kt (buildCarActivationRows, potaValidateSpec, buildCarSessionRow, formatMiles, minutesAgo, carDecodesSecondary), unit-tested directly. QsoStatusScreen maps the app singletons (PotaSessionManager, RotaTripManager, GeneralVariables.QSL_Callsign_list_today, FT8TransmitSignal.mutableQsoCompletedAt) into those helpers.

• Activation rows reuse Restore Android Auto (Play-approved IOT shape) + POTA/ROTA status rows #729's row-priority selection (CAR_ROW_ACTIVATION), so on a tight host they replace the band line rather than being silently dropped.
• The decodes count reads vm.currentMessages (the per-cycle label overlay, cleared on a silent slot) instead of mutableFt8MessageList, which accumulates across cycles when clearDecodesEveryCycle is off (the default) — so "N decodes last cycle" is per-cycle and drops to 0 correctly. (This was the Copilot finding on Car status dashboard: ROTA + POTA-to-validate + session-fallback rows #730, carried over.)
• The removed 3-arg buildCarRotaLine and its tests are replaced by the ROTA row inside buildCarActivationRows.

Notes / judgment calls

• POTA and ROTA are practically mutually exclusive (parked vs. roving), but both are emitted (POTA then ROTA) if both are active; on a 3-row host the tie-break keeps POTA and drops the band line.
• "Session QSOs" uses the today/yesterday worked-callsign set (QSL_Callsign_list_today) — the only cheap in-memory count; "last logged" is best-effort from the last partner + completion timestamp. Both documented at the call site.

Testing

• CarDashboardTest.kt — 17 new tests; full testDebugUnitTest green (incl. the Robolectric manifest-wiring test).
• assembleDebug passes (validates the new string resources + manifest merge).
• ⚠️ Not driven on a real head unit — no device tethered; Android Auto needs a DHU/AAOS host.

Supersedes

Replaces #730 (which was built on the surface overlay #729 deleted). #730 can be closed once this lands.

🤖 Generated with Claude Code

[codecov]

Codecov Report

❌ Patch coverage is 53.44828% with 27 lines in your changes missing coverage. Please review.
✅ Project coverage is 36.23%. Comparing base (a7f2dfb) to head (7abeb58).

Files with missing lines	Patch %	Lines
...n/kotlin/radio/ks3ckc/ft8af/car/QsoStatusScreen.kt	0.00%	26 Missing ⚠️
...main/kotlin/radio/ks3ckc/ft8af/car/CarQsoStatus.kt	96.87%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                dev     #731      +/-   ##
============================================
+ Coverage     36.19%   36.23%   +0.03%     
  Complexity      290      290              
============================================
  Files           244      244              
  Lines         30156    30202      +46     
  Branches       3954     3968      +14     
============================================
+ Hits          10916    10943      +27     
- Misses        18889    18907      +18     
- Partials        351      352       +1     

Flag	Coverage Δ
android	17.89% <53.44%> (+0.10%)	⬆️
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
...main/kotlin/radio/ks3ckc/ft8af/car/CarQsoStatus.kt	96.15% <96.87%> (+0.10%)	⬆️
...n/kotlin/radio/ks3ckc/ft8af/car/QsoStatusScreen.kt	0.00% <0.00%> (ø)

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