refactor: Migrate JSON serialization from Gson to Moshi, adjust ProGuard rules and domain models, and update application ID.

Author: Surjit Kumar Sahoo

app/build.gradle.kts

@@ -50,7 +50,7 @@ android {
   defaultConfig {
     val commitHash = gitCommitHash()
 
-    applicationId = "org.surjit.kahani"
+    applicationId = "com.kahani.app"
     minSdk = 28
     targetSdk = 36
     versionCode = project.property("appVersionCode").toString().toInt()

app/proguard-rules.pro

@@ -1,15 +1,20 @@
-# Gson uses generic type information stored in a class file when working with
-# fields. Proguard removes such information by default, keep it.
--keepattributes Signature
-
-# This is also needed for R8 in compat mode since multiple
-# optimizations will remove the generic signature such as class
-# merging and argument removal. See:
-# https://r8.googlesource.com/r8/+/refs/heads/main/compatibility-faq.md#troubleshooting-gson-gson
--keep class com.google.gson.reflect.TypeToken { *; }
--keep class * extends com.google.gson.reflect.TypeToken
-
-# Optional. For using GSON @Expose annotation
--keepattributes AnnotationDefault,RuntimeVisibleAnnotations
--keep class com.google.gson.reflect.TypeToken { <fields>; }
--keepclassmembers class **$TypeAdapterFactory { <fields>; }
+# Moshi
+-keepclassmembers class * {
+    @com.squareup.moshi.Json <fields>;
+}
+
+# Keep the generated JSON adapters.
+-keep class *JsonAdapter { *; }
+-keep class org.grakovne.lissen.lib.domain.** { *; }
+
+# Keep Moshi's internal classes that use reflection.
+-keep class com.squareup.moshi.** { *; }
+-keep interface com.squareup.moshi.** { *; }
+
+# Attributes for Moshi's reflection.
+-keepattributes Signature, AnnotationDefault, RuntimeVisibleAnnotations, InnerClasses, EnclosingMethod
+
+# Hilt and Dagger rules (usually bundled, but good to ensure)
+-keep class dagger.hilt.android.internal.** { *; }
+-keep class *__HiltBindingModule { *; }
+-keep class org.grakovne.lissen.**_HiltComponents$* { *; }

lib/src/main/kotlin/org/grakovne/lissen/lib/domain/CacheStatus.kt

@@ -1,5 +1,8 @@
 package org.grakovne.lissen.lib.domain
 
+import androidx.annotation.Keep
+
+@Keep
 sealed class CacheStatus {
   data object Idle : CacheStatus()
 

lib/src/main/kotlin/org/grakovne/lissen/lib/domain/LibraryType.kt

@@ -1,5 +1,8 @@
 package org.grakovne.lissen.lib.domain
 
+import androidx.annotation.Keep
+
+@Keep
 enum class LibraryType {
   LIBRARY,
   PODCAST,

lib/src/main/kotlin/org/grakovne/lissen/lib/domain/NetworkType.kt

@@ -1,5 +1,8 @@
 package org.grakovne.lissen.lib.domain
 
+import androidx.annotation.Keep
+
+@Keep
 enum class NetworkType {
 	WIFI,
 	CELLULAR