Add a "New Prefix" (WPX) decode highlight + filter for prefix chasers

[patrickrb]

What & why

Worked All Prefixes (CQ WPX) is one of the most popular amateur-radio award programs — each distinct callsign prefix (W1, VE3, 9A1, DL0, …) counts once, so operators actively hunt "new prefixes" the same way they chase new DXCC entities, zones, states or grids.

The decode list already flags New DXCC / New Zone / New State / New Grid / New Band, but not new prefixes. This PR closes that gap so a WPX chaser can:

• see a NEW PFX pill on any decoded CQ station whose prefix they haven't logged, and
• one-tap the "New Prefix" filter to reduce the decode list to only unworked prefixes.

"Wow, I wish every FT8 app did this." — WPX is a top-three award chase and no Android FT8 app surfaces it live in the decode list.

How it works

• WpxPrefix.of() — a pure, dependency-free CQ WPX prefix extractor:
  • simple calls (W1AW→W1, 9A1AA→9A1, 3DA0RS→3DA0),
  • no-numeral historic calls (RAEM→RA0),
  • portable numbers (W1AW/4→W4),
  • portable prefixes (DL/W1AW→DL0, W1AW/KH6→KH6),
  • ignored operational suffixes (/P /M /MM /AM /QRP),
  • anything that isn't a plausible callsign (grids, reports, hashed calls) returns null so it's never flagged.
    It's shared by the worked-prefix loader and the live decode predicate so the two can never disagree.
• GetAllQSLCallsign builds a distinct worked-prefix set (any band), mirroring the existing worked-grid set; refreshed on the same cadence.
• New NEW_PREFIX status pill (rose, distinct from the other badges), isNewPrefixStation predicate wired into resolveQsoStatus just below New Grid, a "New Prefix" filter chip + empty state, and a Settings → Decode Highlights toggle.

Defaults

The highlight is off by default (like New Grid) — early in an operator's WPX chase almost every prefix is "new", so opt-in keeps the default decode list quiet. The filter chip is always available regardless of the toggle.

Tests

• WpxPrefixTest (pure JUnit) — the extractor across simple, leading-digit, no-numeral, portable-number, portable-prefix, suffix and non-callsign cases.
• NewPrefixTest (Robolectric) — the shared predicate, worked-vs-new behaviour, the pill priority in resolveQsoStatus, and the filterMessages "New Prefix" filter (CQ-only, unworked-only).

All decode + callsign unit tests pass locally (testDebugUnitTest).

Scope / compatibility

Pure UI/logging surface — no change to the decoder, TX pipeline, or FT8/WSJT-X protocol. Follows the exact New DXCC/Zone/State/Grid pattern; the legacy CallingListAdapter is intentionally left untouched (New Zone/State weren't wired there either — the modern Compose decode list is the live path).

🤖 Generated with Claude Code

[codecov]

Codecov Report

❌ Patch coverage is 44.44444% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 36.12%. Comparing base (0360375) to head (b6097f6).
⚠️ Report is 17 commits behind head on dev.

Files with missing lines	Patch %	Lines
...o/ks3ckc/ft8af/ui/settings/DecodeFilterSettings.kt	0.00%	12 Missing ⚠️
...otlin/radio/ks3ckc/ft8af/ui/decode/DecodeScreen.kt	25.00%	3 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                dev     #695      +/-   ##
============================================
- Coverage     36.70%   36.12%   -0.59%     
- Complexity      222      286      +64     
============================================
  Files           227      245      +18     
  Lines         27933    29998    +2065     
  Branches       3485     3935     +450     
============================================
+ Hits          10254    10838     +584     
- Misses        17426    18811    +1385     
- Partials        253      349      +96     

Flag	Coverage Δ
android	17.68% <44.44%> (+1.32%)	⬆️
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
.../src/main/kotlin/radio/ks3ckc/ft8af/theme/Color.kt	96.77% <100.00%> (+0.03%)	⬆️
...lin/radio/ks3ckc/ft8af/ui/components/StatusPill.kt	75.00% <100.00%> (+1.31%)	⬆️
...n/kotlin/radio/ks3ckc/ft8af/ui/decode/DecodeRow.kt	11.36% <100.00%> (+1.45%)	⬆️
...otlin/radio/ks3ckc/ft8af/ui/decode/DecodeScreen.kt	19.11% <25.00%> (+0.14%)	⬆️
...o/ks3ckc/ft8af/ui/settings/DecodeFilterSettings.kt	0.00% <0.00%> (ø)

... and 25 files with indirect coverage changes

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[Copilot]

Pull request overview

Adds CQ WPX “New Prefix” support to the Compose decode list, enabling both a NEW PFX status pill and a “New Prefix” decode filter backed by a shared prefix extractor and an in-memory worked-prefix set.

Changes:

• Introduces WpxPrefix.of() to extract CQ WPX prefixes from decoded/logged callsigns.
• Loads a distinct worked-prefix set from QSLTable and adds NEW_PREFIX pill + “New Prefix” filter + settings toggle/resources.
• Adds unit tests for the new predicate/filter and for the prefix extractor.

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
ft8af/app/src/main/java/com/k1af/ft8af/callsign/WpxPrefix.java	New CQ WPX prefix extractor used by both DB loader and live decode predicate.
ft8af/app/src/test/java/com/k1af/ft8af/callsign/WpxPrefixTest.java	Unit tests for the WPX prefix extractor.
ft8af/app/src/main/java/com/k1af/ft8af/database/DatabaseOpr.java	Loads worked-prefix set from the log and reads highlightNewPrefix config.
ft8af/app/src/main/java/com/k1af/ft8af/GeneralVariables.java	Adds worked-prefix set + highlightNewPrefix toggle + checkQSLPrefix.
ft8af/app/src/main/kotlin/radio/ks3ckc/ft8af/ui/decode/DecodeRow.kt	Adds isNewPrefixStation and wires NEW_PREFIX into resolveQsoStatus.
ft8af/app/src/main/kotlin/radio/ks3ckc/ft8af/ui/decode/DecodeScreen.kt	Adds “New Prefix” filter option, label, empty state, and filter predicate.
ft8af/app/src/main/kotlin/radio/ks3ckc/ft8af/ui/settings/DecodeFilterSettings.kt	Adds Settings toggle for the new-prefix highlight.
ft8af/app/src/main/kotlin/radio/ks3ckc/ft8af/ui/components/StatusPill.kt	Adds QsoStatus.NEW_PREFIX pill styling + label mapping.
ft8af/app/src/main/kotlin/radio/ks3ckc/ft8af/theme/Color.kt	Adds StatusPrefix color constant for the new pill.
ft8af/app/src/main/res/values/strings_compose.xml	Adds strings for the new pill/filter/empty state/settings row.
ft8af/app/src/test/kotlin/radio/ks3ckc/ft8af/ui/decode/NewPrefixTest.kt	Robolectric tests for predicate, pill priority, and “New Prefix” filter.

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