feat: add CW decoder and linear calculator page

app/build.gradle.kts

@@ -1,3 +1,12 @@
 plugins {
     alias(libs.plugins.convention.applicationPlugin)
 }
+
+android {
+    // PR #1 CW decoder uses the Morse Expert native decoder, which ships only armeabi-v7a.
+    defaultConfig {
+        ndk {
+            abiFilters += listOf("armeabi-v7a")
+        }
+    }
+}