feat(cw): port Morse Expert 1.15 CW decoder engine (feature:cw compiles)

Full port of the CW/Morse decoder from Morse Expert 1.15
(com.ve3nea.morse_expert), preserving obfuscated class names and logic.
Ads (gms.ads), billing (BillingClient), and library code were removed per
user; SettingsActivity deferred to Compose integration.

Ported modules:
- pas.*: decoder engine interface + JNI (libnativedecoderjni.so, armeabi-v7a)
- k3.*: FFT library (pseudo-enum q rewritten from smali; sun.misc stubs
  for Unsafe/Cleaner since Android lacks them; FFT path uses float[] branch)
- i3.*, g3.*, j3.*, s.*, d1.AbstractC1518b: DSP/sin-cos tables (long[] tables
  f/f11589g restored from smali)
- H2.a/b: audio capture + decode control core (jadx catch-block illusions
  cleaned per smali; recording try/catch restored around write block)
- J2.a/b: waterfall OpenGL renderer + palette (r10 = anchor color per smali)
- E2.g: waterfall touch frequency picker (height = ScaleView per smali)
- B0.b/B.RunnableC0001b: status-bar + decoded-text UI runnables (real
  constructors recovered from smali)
- MainActivity → controller class (Activity injected; immersive status bar
  inlined); C1646n trimmed to view holder; D.n keeps waterfall texture case
- F2.a: text selection menu (Save/Share)

Verified: :feature:cw:compileDebugJavaWithJavac BUILD SUCCESSFUL.

feature/cw/src/main/java/k3/f.java

@@ -0,0 +1,32 @@
+package k3;
+
+/* loaded from: classes.dex */
+public final class f implements Runnable {
+    public long f;
+
+    /* renamed from: g, reason: collision with root package name */
+    public final long f12100g;
+
+    /* renamed from: h, reason: collision with root package name */
+    public final long f12101h;
+
+    public f(long j4, long j5, long j6) {
+        this.f = j4;
+        this.f12100g = j5;
+        this.f12101h = j6;
+    }
+
+    @Override // java.lang.Runnable
+    public final void run() {
+        long j4 = this.f;
+        if (j4 != 0) {
+            r.f12109a.freeMemory(j4);
+            this.f = 0L;
+            long j5 = K1.a.c - (this.f12100g * this.f12101h);
+            K1.a.c = j5;
+            if (j5 < 0) {
+                K1.a.c = 0L;
+            }
+        }
+    }
+}