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/res/values/app_values.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="purple_500">#ff6200ee</color>
+    <integer name="default_font_size">18</integer>
+    <string name="app_name">Morse Expert</string>
+    <string name="idle">Idle</string>
+    <string name="waterfall_display">Waterfall display</string>
+    <string name="frequency_scale">Frequency scale</string>
+    <string name="decoded_text">Decoded text</string>
+    <string name="clear">Clear</string>
+    <string name="pause">Pause Decoding</string>
+    <string name="save_text">Save Text</string>
+    <string name="record_signals">Record Signals</string>
+    <string name="settings">Settings</string>
+    <string name="help">Online Help</string>
+    <string name="rate">Rate this App</string>
+    <string name="premium">Get Premium Version</string>
+    <string name="tap_back_again_to_close">Tap Back again to close the app</string>
+    <string name="message_type">Message Type</string>
+</resources>