fix: broaden linear transponder matching and deduplicate same-range entries

- isNamedLinearTransponder: match ' Lin' prefix (AO-7 style) and
  add fallback branch (hasLinearName && hasLinearMode) for entries
  with 'Linear'/'Lin' but no 'transponder' word (AO-7, AO-73)
- add deduplicateTransponders: merge entries sharing the same
  uplink/downlink frequency range, preferring non-CW entry
  (AO-7 Mode A had separate SSB and CW entries; JO-97 had
  separate CW and SSB Transponder entries)
- apply dedup in CalculatorPage filter chain
- 6 new tests, 23 total, all passing

feature/radar/src/main/java/com/rtbishop/look4sat/feature/radar/TransceiversPage.kt

@@ -148,6 +148,7 @@ fun CalculatorPage(
 ) {
     val calculatorTransceivers = remember(transceivers) {
         transceivers.filter(DopplerFrequencyCalculator::isNamedLinearTransponder)
+            .let(DopplerFrequencyCalculator::deduplicateTransponders)
     }
     val selectedTransceiver = remember(calculatorTransceivers, selectedUuid) {
         calculatorTransceivers.firstOrNull { it.uuid == selectedUuid }