remove CW decoder (audio->text) entirely; fix CWX macro not stopping on call typing

- Removes the RX-audio CW decoder: deletes app_cw.go + internal/cwdecode, the
  cwDecoder/cwPitchHz/cwMu/cwStop App fields, and all frontend state/effects, the
  header Ear button, the Tools menu item and the decoded-text strip. The CW
  KEYER (WinKeyer/Icom/Flex) is untouched.
- Fix: typing a callsign while a macro is keying now aborts the CURRENT engine
  (Flex CWX / Icom / WinKeyer) on the first character, not just WinKeyer during
  an auto-call loop — via a shared stopKeyerTx() helper.

internal/cwdecode/cwdecode_test.go

@@ -1,201 +0,0 @@
-package cwdecode
-
-import (
-	"math"
-	"strings"
-	"testing"
-)
-
-// reverse Morse map for the synthesizer.
-func charToMorse() map[byte]string {
-	m := map[byte]string{}
-	for code, ch := range morse {
-		m[ch] = code
-	}
-	return m
-}
-
-// keyMessage synthesizes a clean keyed tone for msg at the given WPM/pitch.
-func keyMessage(msg string, fs, wpm int, pitch float64) []int16 {
-	return keyMessageAmp(msg, fs, wpm, pitch, 9000)
-}
-
-func keyMessageAmp(msg string, fs, wpm int, pitch, amp float64) []int16 {
-	dot := fs * 1200 / (wpm * 1000) // samples per dot
-	c2m := charToMorse()
-	var out []int16
-	phase := 0.0
-	dphi := 2 * math.Pi * pitch / float64(fs)
-
-	tone := func(n int) {
-		for i := 0; i < n; i++ {
-			out = append(out, int16(amp*math.Sin(phase)))
-			phase += dphi
-		}
-	}
-	silence := func(n int) {
-		for i := 0; i < n; i++ {
-			out = append(out, 0)
-		}
-	}
-
-	silence(fs / 4) // 250 ms lead-in for AGC warmup
-	for i := 0; i < len(msg); i++ {
-		ch := msg[i]
-		if ch == ' ' {
-			silence(7 * dot)
-			continue
-		}
-		code := c2m[ch]
-		for j := 0; j < len(code); j++ {
-			if code[j] == '.' {
-				tone(dot)
-			} else {
-				tone(3 * dot)
-			}
-			silence(dot) // inter-element gap
-		}
-		silence(3 * dot) // inter-character gap (on top of the trailing element gap)
-	}
-	silence(fs / 4)
-	return out
-}
-
-func TestDecodeCleanSignal(t *testing.T) {
-	const fs = 16000
-	var sb strings.Builder
-	d := New(fs, func(s string) { sb.WriteString(s) }, nil)
-
-	// Repeat so AGC warm-up only costs the first word.
-	samples := keyMessage("PARIS PARIS PARIS", fs, 22, 700)
-	// Feed in small chunks like the live capture would.
-	for i := 0; i < len(samples); i += 256 {
-		end := i + 256
-		if end > len(samples) {
-			end = len(samples)
-		}
-		d.Process(samples[i:end])
-	}
-
-	got := strings.ToUpper(sb.String())
-	if !strings.Contains(got, "PARIS") {
-		t.Fatalf("decoded %q, want it to contain PARIS", got)
-	}
-}
-
-func TestDecodeWithQRM(t *testing.T) {
-	const fs = 16000
-	// Target at 700 Hz; a strong interfering keyed signal at 950 Hz, slightly
-	// quieter, sending different text. The pitch lock should hold on the target.
-	target := keyMessageAmp("PARIS PARIS PARIS", fs, 20, 700, 9000)
-	qrm := keyMessageAmp("BK DE QRZ QRZ TEST", fs, 26, 950, 6500)
-	mix := make([]int16, len(target))
-	for i := range target {
-		v := int(target[i])
-		if i < len(qrm) {
-			v += int(qrm[i])
-		}
-		if v > 32767 {
-			v = 32767
-		} else if v < -32768 {
-			v = -32768
-		}
-		mix[i] = int16(v)
-	}
-
-	var sb strings.Builder
-	d := New(fs, func(s string) { sb.WriteString(s) }, nil)
-	for i := 0; i < len(mix); i += 256 {
-		end := i + 256
-		if end > len(mix) {
-			end = len(mix)
-		}
-		d.Process(mix[i:end])
-	}
-	got := strings.ToUpper(sb.String())
-	if !strings.Contains(got, "PARIS") {
-		t.Fatalf("with QRM, decoded %q, want it to contain PARIS", got)
-	}
-}
-
-func TestDecodeFirstCharStrong(t *testing.T) {
-	const fs = 16000
-	var sb strings.Builder
-	d := New(fs, func(s string) { sb.WriteString(s) }, nil)
-	// Strong signal: the very first element (T = a dash) must not be eaten by
-	// lock acquisition. Output should begin with the first character.
-	samples := keyMessageAmp("TEST DE", fs, 20, 700, 16000)
-	for i := 0; i < len(samples); i += 200 {
-		end := i + 200
-		if end > len(samples) {
-			end = len(samples)
-		}
-		d.Process(samples[i:end])
-	}
-	got := strings.ToUpper(strings.TrimSpace(sb.String()))
-	if !strings.HasPrefix(got, "TEST") {
-		t.Fatalf("first chars lost on a strong signal: decoded %q, want it to start with TEST", got)
-	}
-}
-
-func TestDecodeWithAmplitudeRipple(t *testing.T) {
-	const fs = 16000
-	// A real signal's tone amplitude wobbles within a mark; if the floor chases
-	// it, dashes fragment into dots ("all dots" garbage). Apply ±30% ripple.
-	samples := keyMessageAmp("CQ TEST DE OM", fs, 24, 800, 10000)
-	rp := 0.0
-	for i := range samples {
-		rp += 2 * math.Pi * 35 / float64(fs) // 35 Hz amplitude wobble
-		samples[i] = int16(float64(samples[i]) * (1 + 0.3*math.Sin(rp)))
-	}
-	var sb strings.Builder
-	d := New(fs, func(s string) { sb.WriteString(s) }, nil)
-	for i := 0; i < len(samples); i += 256 {
-		end := i + 256
-		if end > len(samples) {
-			end = len(samples)
-		}
-		d.Process(samples[i:end])
-	}
-	got := strings.ToUpper(sb.String())
-	if !strings.Contains(got, "TEST DE OM") {
-		t.Fatalf("dashes fragmented under amplitude ripple: decoded %q", got)
-	}
-}
-
-func TestDecodeCQFixedPitch(t *testing.T) {
-	const fs = 16000
-	var sb strings.Builder
-	d := New(fs, func(s string) { sb.WriteString(s) }, nil)
-	d.SetTarget(700) // fixed pitch like the user's manual override
-	samples := keyMessageAmp("CQ CQ CQ DE OM", fs, 26, 700, 9000)
-	for i := 0; i < len(samples); i += 200 {
-		end := i + 200
-		if end > len(samples) {
-			end = len(samples)
-		}
-		d.Process(samples[i:end])
-	}
-	got := strings.ToUpper(sb.String())
-	if n := strings.Count(got, "CQ"); n < 2 {
-		t.Fatalf("first element of CQ dropped: decoded %q (only %d CQ)", got, n)
-	}
-}
-
-func TestDecodeNumbersAndProsign(t *testing.T) {
-	const fs = 16000
-	var sb strings.Builder
-	d := New(fs, func(s string) { sb.WriteString(s) }, nil)
-	samples := keyMessage("TEST 599 TEST", fs, 18, 650)
-	for i := 0; i < len(samples); i += 200 {
-		end := i + 200
-		if end > len(samples) {
-			end = len(samples)
-		}
-		d.Process(samples[i:end])
-	}
-	got := strings.ToUpper(sb.String())
-	if !strings.Contains(got, "599") {
-		t.Fatalf("decoded %q, want it to contain 599", got)
-	}
-}