Add stability configuration and apply @immutable annotation to data classes (#1606)

Add stability configuration and apply @immutable annotation to data
classes, add fix type method

### **Before compose compiler add stability**

<img width="840" height="706" alt="Screenshot 2025-08-20 at 19 16 01"
src="https://github.com/user-attachments/assets/cfc2a6f6-eb97-4222-8af8-9952a38fdee3"
/>

### 
**After add stability configuration** 

<img width="968" height="695" alt="Screenshot 2025-08-20 at 19 37 00"
src="https://github.com/user-attachments/assets/68e8d573-a35c-48de-b8c1-a6ea1fd7fcc7"
/>

Author: bentrengrove

Jetcaster/core/data/src/main/java/com/example/jetcaster/core/data/database/model/EpisodeToPodcast.kt

@@ -16,11 +16,13 @@
 
 package com.example.jetcaster.core.data.database.model
 
+import androidx.compose.runtime.Immutable
 import androidx.room.Embedded
 import androidx.room.Ignore
 import androidx.room.Relation
 import java.util.Objects
 
+@Immutable
 class EpisodeToPodcast {
     @Embedded
     lateinit var episode: Episode

Jetcaster/core/domain/src/main/java/com/example/jetcaster/core/model/CategoryInfo.kt

@@ -16,8 +16,10 @@
 
 package com.example.jetcaster.core.model
 
+import androidx.compose.runtime.Immutable
 import com.example.jetcaster.core.data.database.model.Category
 
+@Immutable
 data class CategoryInfo(val id: Long, val name: String)
 
 const val CategoryTechnology = "Technology"

Jetcaster/core/domain/src/main/java/com/example/jetcaster/core/model/EpisodeInfo.kt

@@ -16,13 +16,16 @@
 
 package com.example.jetcaster.core.model
 
+import androidx.compose.runtime.Immutable
 import com.example.jetcaster.core.data.database.model.Episode
 import java.time.Duration
 import java.time.OffsetDateTime
 
 /**
  * External data layer representation of an episode.
  */
+
+@Immutable
 data class EpisodeInfo(
     val uri: String = "",
     val podcastUri: String = "",

Jetcaster/core/domain/src/main/java/com/example/jetcaster/core/model/FilterableCategoriesModel.kt

@@ -16,9 +16,13 @@
 
 package com.example.jetcaster.core.model
 
+import androidx.compose.runtime.Immutable
+
 /**
  * Model holding a list of categories and a selected category in the collection
  */
+
+@Immutable
 data class FilterableCategoriesModel(val categories: List<CategoryInfo> = emptyList(), val selectedCategory: CategoryInfo? = null) {
     val isEmpty = categories.isEmpty() || selectedCategory == null
 }

Jetcaster/core/domain/src/main/java/com/example/jetcaster/core/model/PodcastCategoryFilterResult.kt

@@ -16,9 +16,12 @@
 
 package com.example.jetcaster.core.model
 
+import androidx.compose.runtime.Immutable
+
 /**
  * A model holding top podcasts and matching episodes when filtering based on a category.
  */
+@Immutable
 data class PodcastCategoryFilterResult(
     val topPodcasts: List<PodcastInfo> = emptyList(),
     val episodes: List<PodcastToEpisodeInfo> = emptyList(),

Jetcaster/core/domain/src/main/java/com/example/jetcaster/core/model/PodcastInfo.kt

@@ -16,13 +16,15 @@
 
 package com.example.jetcaster.core.model
 
+import androidx.compose.runtime.Immutable
 import com.example.jetcaster.core.data.database.model.Podcast
 import com.example.jetcaster.core.data.database.model.PodcastWithExtraInfo
 import java.time.OffsetDateTime
 
 /**
  * External data layer representation of a podcast.
  */
+@Immutable
 data class PodcastInfo(
     val uri: String = "",
     val title: String = "",

Jetcaster/core/domain/src/main/java/com/example/jetcaster/core/model/PodcastToEpisodeInfo.kt

@@ -16,8 +16,10 @@
 
 package com.example.jetcaster.core.model
 
+import androidx.compose.runtime.Immutable
 import com.example.jetcaster.core.data.database.model.EpisodeToPodcast
 
+@Immutable
 data class PodcastToEpisodeInfo(val episode: EpisodeInfo, val podcast: PodcastInfo)
 
 fun EpisodeToPodcast.asPodcastToEpisodeInfo(): PodcastToEpisodeInfo = PodcastToEpisodeInfo(

Jetcaster/core/domain/src/main/java/com/example/jetcaster/core/player/EpisodePlayer.kt

@@ -16,11 +16,14 @@
 
 package com.example.jetcaster.core.player
 
+import androidx.compose.runtime.Immutable
 import com.example.jetcaster.core.player.model.PlayerEpisode
 import java.time.Duration
 import kotlinx.coroutines.flow.StateFlow
 
 val DefaultPlaybackSpeed = Duration.ofSeconds(1)
+
+@Immutable
 data class EpisodePlayerState(
     val currentEpisode: PlayerEpisode? = null,
     val queue: List<PlayerEpisode> = emptyList(),

Jetcaster/core/domain/src/main/java/com/example/jetcaster/core/player/model/PlayerEpisode.kt

@@ -16,6 +16,7 @@
 
 package com.example.jetcaster.core.player.model
 
+import androidx.compose.runtime.Immutable
 import com.example.jetcaster.core.data.database.model.EpisodeToPodcast
 import com.example.jetcaster.core.model.EpisodeInfo
 import com.example.jetcaster.core.model.PodcastInfo
@@ -25,6 +26,8 @@ import java.time.OffsetDateTime
 /**
  * Episode data with necessary information to be used within a player.
  */
+
+@Immutable
 data class PlayerEpisode(
     val uri: String = "",
     val title: String = "",

Jetcaster/mobile/build.gradle.kts

@@ -97,6 +97,12 @@ android {
         excludes += "/META-INF/AL2.0"
         excludes += "/META-INF/LGPL2.1"
     }
+
+    composeCompiler {
+        reportsDestination = layout.buildDirectory.dir("compose_compiler")
+        metricsDestination = layout.buildDirectory.dir("compose_compiler")
+        stabilityConfigurationFiles = listOf(rootProject.layout.projectDirectory.file("stability_config.conf"))
+    }
 }
 
 dependencies {